Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9ff8b2a4c0cc4c…

MALICIOUS

PDF

75.6 KB Created: 2021-02-15 20:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c33022cfb37be062a11341321421153f SHA-1: 378c9b6624eaa2f8c69ea4f395b075d4c21364d3 SHA-256: 5c9ff8b2a4c0cc4c30b5e56566ae2f09c5ede7704024b94c0038f34554a33dd8
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://crophysi.ru/123?utm_term=american+gods+season+3+episode+5+cast PDF link annotation
    • https://cdn.sqhk.co/belumozobu/vyxgesF/17550663606.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481280/normal_5fde5fba52b9d.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/Egjwhi9/10183024198.pdfIn PDF document text
    • http://frasqen.online/software_asset_management60wz1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_600a0e13e0714.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/0rgcgi8/18090916538.pdfIn PDF document text
    • https://pomadiwu.weebly.com/uploads/1/3/5/3/135313662/fc6112c65.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/ierghjb/17301395498.pdfIn PDF document text
    • https://mopuvavipobum.weebly.com/uploads/1/3/1/0/131070525/mowetijawobujis.pdfIn PDF document text
    • https://reratedazakowim.weebly.com/uploads/1/3/1/3/131378897/aef0e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5fe487e456677.pdfIn PDF document text
    • http://xidotamasaw.22web.org/derivative_power_rule_practice_worksheet.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://s3.amazonaws.com/lekezaru/lubumu.pdfIn PDF document text
    • http://jitimixilu.epizy.com/bajarangi_kannada_film.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/81386803874.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/tikuw.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/79787500338.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 5428 bytes
SHA-256: 37ea44bb31ddde77eb81d337f5a6213e283f069c44cfd4358d2a76421ec665ff
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10616 bytes
SHA-256: 0df1f3bb79a785086be0a07a3b6347bf59af88eb3ebd25671a2ce9800c587800
font_02_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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