Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdca2425d036eb58…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 09:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1342f8a85545019a82c610fc1dcdfaa0 SHA-1: 5412ea14665dba82341b839c7473211c337f86f5 SHA-256: cdca2425d036eb58a85478469977bbdfdaf83f3494a20eb70230605818e03fe6
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 mass external link farm with 30 distinct links, many hosted on disposable domains, indicating a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded URLs and the nature of the link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=angiographic+guidewire+machine PDF link annotation
    • http://prognoz-football.club/milkweed_book_sparknotes7l25n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5ff2a5c62be9e.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/CgiErAU/34060227911.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/fhfiijc/34114346330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5ff84a7e53fa5.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/jaBz8hb/gamestop_prestige_orange_city.pdfIn PDF document text
    • http://mirror-x.org/783397438901jc5s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376127/normal_5fc6c93c418b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5ffdd84c7cfb0.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/idiawjj/toddler_boy_hairstyles_braids.pdfIn PDF document text
    • http://domen3.club/king_lear_characters_list6qni5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408881/normal_603748e63f5d3.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/PiaUgdD/warhammer_age_of_sigmar_armies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_603ed24daaae1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_608611fded28453284341c2727119343.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_5fd024dad9d446c9a171dcd2cc045922.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 5356 bytes
SHA-256: 9a90554d7206534f947b06e26943a1b847f5412125ffd7e5180e7d52148272dc
font_01_sfnt_off00010802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10664 bytes
SHA-256: 9e62ff36963c260d9fded3134ea6e29de52a038cc6d4b1f6dcc972b4c4ebb26d

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