Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ef8c6d8e4b118e…

MALICIOUS

PDF

73.4 KB Created: 2021-01-19 20:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d9c7e33e98705e0e898bfe112f486196 SHA-1: 1350150f54e46ffa1231695024c665b5e26ba598 SHA-256: 49ef8c6d8e4b118e602f4436c84b84fe59ee1498efa8c5bee9e5c70b5682e593
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs suggest the document is designed to redirect users to external sites, potentially for phishing or malware delivery. The embedded URL 'https://seumenha.ru/123?utm_term=1756+enbt+error+codes' is a primary indicator of this redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=1756+enbt+error+codes PDF link annotation
    • https://cdn.sqhk.co/muwazubivotu/UijTGig/archipelago_botanicals_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/LB8gjGi/86457918482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fccdc6b4f570.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ghbgcYN/mirrors_lyrics_meaning.pdfIn PDF document text
    • https://site-1168170.mozfiles.com/files/1168170/classic_wow_gold_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/vozupowo/dgfiagc/celebrity_cruises_reviews_infinity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5fd9d9be235d6.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jblrjjq/parental_control_app_blocker_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/geHJLgc/.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://raseloxezonavo.epizy.com/95643956710.pdfIn PDF document text
    • http://sogigadataga.epizy.com/anakin_vs_obi_wan_piano.pdfIn PDF document text
    • http://povumuvepu.epizy.com/votusadugupomigufa.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/zunojifokezanogexureziju.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/62925129509.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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 4884 bytes
SHA-256: 001c0f22dd2543e91e07145eb9169bb682ea8e9a280301ff536641d03ebcc603
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 11516 bytes
SHA-256: 42f7e01251ed41412b58be1e52266e00efff6569bcbad40fdb5ef14fec9bab46
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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