Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a2fa35f30ef367…

MALICIOUS

PDF

81.3 KB Created: 2021-03-31 06:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ccf541c3e43a37022acaa6c3e9be0e47 SHA-1: 93cd34dcdd43612a7f58187208a3a3ae266b741b SHA-256: 49a2fa35f30ef36744260c6fe797fb68c2fe50d14e410ddb71d914dc91480ae0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document acts as a link farm, presenting a lure related to free book downloads to encourage users to click on external links. The document contains numerous URLs pointing to other PDFs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or engage in SEO manipulation for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/award?keyword=bulleh+shah+books+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486351/normal_601e37839aad4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378608/normal_5ffb842ebe7b6.pdfIn PDF document text
    • http://lagegisujego.iblogger.org/proper_bed_making_top_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_601ba89dabca4.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/jejodiwig-vetoponobuji-riwujonava.pdfIn PDF document text
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/a37a4f7cf6d86c.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/3099002.pdfIn PDF document text
    • http://ragukir.iblogger.org/gubedisujijabed.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/fb243235da.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/tedulunupapewezadi.pdfIn PDF document text
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/gokerisejugesurivunu.pdfIn PDF document text
    • https://vidijizuv.weebly.com/uploads/1/3/0/7/130776341/549c9e9d4ec1a63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/bukasulore.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_d2b1ccf4bbb7436582ee9f4044cae199.pdf?index=trueIn PDF document text
    • http://sapataxetawot.epizy.com/belemogigipuxeleviraropip.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_a24e3aaf22444e668eda8a179a3b603c.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_02f570e7a3544cafbadb8102806af227.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_53fe7d7ea7e74e6bbb48a5d81f9d5d4f.pdf?index=trueIn PDF document text
    • http://nowutakifotekes.epizy.com/arduino_beginner_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/kuxabegenunu.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/10036761823.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/kupakibojogegulekifumi.pdfIn PDF document text
    • http://famuruvif.epizy.com/sobig.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/xobaliluw.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 6548 bytes
SHA-256: 370b63e99b3bc2c1d8b7a2bfc1693e0257dccade0e64e814f912f9e1c3af29e8
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 5472 bytes
SHA-256: 787b186ab63dd9d9a8069b8d92def295e8ad88c4f06e3831ef8bc6b1e16b0aa4
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 11552 bytes
SHA-256: 0e78eb680e5751b741c66504fab09ea1967877e93d29ec5cdc0c5a89b450ada2

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