Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8c11178c8ddafd…

MALICIOUS

PDF

79.6 KB Created: 2021-02-01 07:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 20322afa39aa23d69cf9e24438c3beb2 SHA-1: ce269aebdf7d3380692d26fd7a560c72cd43346a SHA-256: 0c8c11178c8ddafd85409e9ab574fcc5444c779bcdb7f3555118699cd8fabc09
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, many of which appear to be disposable or used for link farming. This behavior, combined with ML and ClamAV detections, strongly suggests a malicious intent, likely for SEO spam or phishing. No scripts were extracted, but the structure of the PDF itself is indicative of malicious activity.

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://seumenha.ru/123?utm_term=2000+isuzu+trooper+repair+manual PDF link annotation
    • https://cdn.sqhk.co/disumuneriva/igggTpW/pantone_color_harmony_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/hcie5uJ/wolfquest_anniversary_edition_updates.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/c2f79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459182/normal_5ff134940d9c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fe3986e37f15.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/5710334.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/4sgcCF9/47804849668.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/rggED7I/6295804409.pdfIn PDF document text
    • https://gafokogem.weebly.com/uploads/1/3/0/8/130874161/1782850.pdfIn PDF document text
    • https://cdn.sqhk.co/kupodakojav/icRjhjj/bajovutukofef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_6012789173659.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/zawisuvukogon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fe6103bacc79.pdfIn PDF document text
    • https://mubonunegaj.weebly.com/uploads/1/3/0/8/130874179/6295121.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/lgfhaHy/world_war_polygon_ww2_shooter_rexdl.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/gomevod.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
    • 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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 5076 bytes
SHA-256: 771a9d11d1fe9372280d9375e4eddd96a4f80a8277a5e5c7732abc405ff4fb18
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 10948 bytes
SHA-256: 924d37f74e5d63ded2626ef9be5346eae8de7b320d7434f6c5da90a6b645df4a
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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