Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca4c7e4ebb9daec…

MALICIOUS

PDF

139.3 KB Created: 2021-06-08 18:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8ede4391e357fcb50136bac8ecc05f5 SHA-1: 15fa93e9b104f25b6ef613e4fde90f00662a7106 SHA-256: cca4c7e4ebb9daec40f2c5b9ea911977d98752067252944e7e8bf237b6fbe4b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9943

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://archism.ru/pbw?utm_term=hum+saath+saath+full+hd+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419192/normal_605c6aa79d3a9.pdfIn PDF document text
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/767211.pdfIn PDF document text
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/f67b10c3cd.pdfIn PDF document text
    • https://lurekoba.weebly.com/uploads/1/3/4/0/134018443/8720108.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/sakojodi.pdfIn PDF document text
    • https://goziluzigawu.weebly.com/uploads/1/3/2/8/132816100/fuken.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/josuzikofurideb-zoworunawubaf-zasakidogumodam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_605ee2b7c7c69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_601b6f5fb8e64.pdfIn PDF document text
    • https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/vuragipiveja_fuvamolawifozup_piwopaberiguk.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/pijopafuzesutixiw.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/51f0f9dec.pdfIn PDF document text
    • https://jidisozipu.weebly.com/uploads/1/3/4/4/134440811/682f817b932e2ec.pdfIn PDF document text
    • https://jaxanotev.weebly.com/uploads/1/3/1/1/131164383/ronare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144418464/cest_si_bon_bakery_locations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5706b65-8d8b-45ba-a542-5b8615ca5a4d/93300587306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f255bcf-f917-45a9-9a8f-5dbebb61058d/53499209737.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144767562/tercer_cielo_yo_te_extranare_descargar_gratis.pdfIn PDF document text
    • http://vesusezipuwe.pbworks.com/w/file/fetch/144783648/how_much_do_security_guards_make_in_nyc.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/w/file/fetch/144765567/savowilekavit.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144582132/97190205778.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B25 6832 bytes
SHA-256: 599f443e9c382b970ab3819494bc2418e26b0ab320c04800f9e708d03b93c4b5
font_01_sfnt_off00017c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C43 13052 bytes
SHA-256: 0d2bc8ef813ef840bd9157aba907092db67e5268c3ad8cb64d3373555526b74c
font_02_sfnt_off0001a760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A760 5072 bytes
SHA-256: b18e5ac23c925c8036a996eb2f2db4ae5e8149360b6a419d271309808b9640cf
font_03_sfnt_off0001b87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B87C 2852 bytes
SHA-256: 29beaa3283e4304cda8c5ee59ae6b3f6e8bd3afe07803c9daa742ad5c4e0ea1d
font_04_sfnt_off0001c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4A1 15944 bytes
SHA-256: d90f2dcc970a5520fe3f2c9cea1b38df7fc8096f945d89b08d6ffbf35407772e
font_05_sfnt_off0001f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6AC 16476 bytes
SHA-256: 936d619e82974c13125ee8e8e5ed0b44a6dfbead6c509fc7fca9a4061ea93107
font_06_sfnt_off00020d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D46 4424 bytes
SHA-256: f2445dc7f451cfe82c8eb4fc10ea5cdd8a96848f964a73dab265b727bb15dc81

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