Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91655f7c5c66c1d…

MALICIOUS

PDF

72.9 KB Created: 2021-03-10 13:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c7f2ec7273124ab965f59ec44fb58b8 SHA-1: 995f5695b196818d5a3e7345a05d1638ea290f21 SHA-256: a91655f7c5c66c1d4037223e274220574d0436856fc91c247185d76d2d18d0e9
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 0.9998

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://vilenefex.ru/strik?utm_term=when+the+sun+comes+up+in+the+morning+hymn PDF link annotation
    • https://bevubulik.weebly.com/uploads/1/3/2/6/132680874/sujudas-kajekig-nepufo-xovaxarasew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372382/normal_5ffb28468b25a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6022f529979b4.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/5c637611a10943a.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/sezugonupumubesivizi.pdfIn PDF document text
    • https://gogesixemaso.weebly.com/uploads/1/3/2/3/132302802/jilibajidapive.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/salary_of_data_scientist_in_pakistan.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/microeconomics_book_class_11_sandeep_garg.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/1380932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404741/normal_5fdc9889c3370.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/7c6a094301a4.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://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_416d88b2c3aa4b83a0186882df0c0cd2.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_dc29eeca6927421382c2febdcea4caf3.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_c2e180c3adea44cba654514fe30d776f.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_5d2bd7b740844d39bce8cb613358e7ad.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_20fbacce7d1142318847b2328a881100.pdf?index=trueIn PDF document text
    • http://xutenasejubibe.atwebpages.com/14476581905.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 5100 bytes
SHA-256: c83aea1161b4e25f9af015cab9cd1881322ec4729cde2b49d733c3bbddb94997
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10360 bytes
SHA-256: bd4681202ede1f43d67c073d25c1e1ac81710b2e6fbdef476ac56ed178b1b74c
font_02_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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