Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ec2b60fb7ab93d…

MALICIOUS

PDF

107.8 KB Created: 2021-04-09 03:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7b31b15872700a32a7037096f09f308c SHA-1: 5818db53834836f47b39449f3274439b88e36a39 SHA-256: 35ec2b60fb7ab93d68ac1e9c0ec709cd67cccbfef345914fa58dc69663358d28
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9143

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=d%2526d+beyond+custom+classes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471691/normal_6041b66c715bc.pdfIn PDF document text
    • http://andyhongdigital.com/zanelodimakotumi8x5c5.pdfIn PDF document text
    • http://like-store.site/xowirazipatexadunugojydh4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fd8cf6cee502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_600b6b1061d01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_6058464deb217.pdfIn PDF document text
    • http://faceit.su/adidas_sports_watch_price_philippineslokr0.pdfIn PDF document text
    • http://indir-kazan.com/84895147825xdal8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_5fcc28706c262.pdfIn PDF document text
    • https://rusakubasarozu.weebly.com/uploads/1/3/4/2/134266120/e831fb4d274.pdfIn PDF document text
    • http://bossyonlinex.com/australian_apprenticeship_incentive_program_guidelines0ler4.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/fidibabatape-kilimurasav-worobuzesu-lezit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_603eb254a8c2a.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/d5db5981550011d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_6016b46e01858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600aeabae5835.pdfIn PDF document text
    • http://profaudit32.ru/serogidiwufaf3qzmh.pdfIn PDF document text
    • http://gloslides.com/how_to_change_a_garage_keypad_codeu5sht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_601cb64bafeb5.pdfIn PDF document text
    • http://front-glass.website/stewart_multivariable_calculusegice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_604843a8f230b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_87d81c1a7d09487aae35e0cd843366c4.pdf?index=trueIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_221b48d12bad44f495296e3a913445fb.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_e34aa02597e64e049e6346969de1e68a.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_cda93c60543f4262a6ac238ca12777bf.pdf?index=trueIn PDF document text
    • https://539b613c-a54f-4c74-97b0-41cdc0f13365.filesusr.com/ugd/f6e6b4_3a222fda73fb496585540b4e8e43459c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00018ed8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18ED8 6504 bytes
SHA-256: f8ebae8ea2381a5f5a5db4f03c6c737f92a142e66c67ccbdc2f7fea2b5259cac
font_00_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 7516 bytes
SHA-256: 76f34301b0f0f3260df63e8e06ee417912ceebc1ec9b161224d906abd4afa021
font_01_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 3148 bytes
SHA-256: 3d18dca7e3151ab78b523ac4104e86b88c6789bd7feb2b9d7711bf9cdfa03466
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 3484 bytes
SHA-256: 10b1e8ca5c1ffd40509c37c8d23269801adcfe34a1607cb54df6c3846a3e687a
font_03_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 6280 bytes
SHA-256: a3b179770175167fc105d601e782d97fe9fd5fdbff0be5084ea02020e73dba2c
font_04_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 19028 bytes
SHA-256: 36539f6d1ec510897bfbe252ff62363040aa090ee9456364b11a9baa8713665a
font_05_sfnt_off00016a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A75 16516 bytes
SHA-256: f3bf7d65e83e0dc75c5df7c05093edf1192c13d377daee4cf108b80aa32c4637
font_06_sfnt_off00018116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18116 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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