Malicious PDF — malware analysis report

Static analysis result for SHA-256 0553b3242707ae0d…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 04:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3c9fea5c4e29ff3ba440f7d5ecca9d4 SHA-1: 971a2a196c115bbca2458fa7bfc81c6aab2c111e SHA-256: 0553b3242707ae0d4f9bac59316068cac9685549525763f6c21422c037c43592
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=blogging+all-in-one+for+dummies+pdf+free+download
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/5033326.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_601448942d3ca.pdf
    • https://cdn-cms.f-static.net/uploads/4419211/normal_602e6a1ace048.pdf
    • https://cdn.sqhk.co/vewukiziwemi/MijiLja/car_bingo_printables_australia.pdf
    • http://vomojagibolib.iblogger.org/bojirumexikarufu.pdf
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/wuwiku-gefab-tizuf-baxujago.pdf
    • https://cdn.sqhk.co/tiwefuxab/dEDggE2/50072502384.pdf
    • https://cdn-cms.f-static.net/uploads/4389104/normal_6031720f13420.pdf
    • https://cdn.sqhk.co/gituxogud/gfujdgk/voa_farsi_live_online.pdf
    • https://static.s123-cdn-static.com/uploads/4456699/normal_5ff88cf6967e7.pdf
    • https://cdn.sqhk.co/zijatiki/jGcjdha/sniper_vs_run_fortnite_code.pdf
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdf
    • https://cdn-cms.f-static.net/uploads/4417429/normal_6037110956d6d.pdf
    • https://cdn.sqhk.co/pinofizulag/eKuVihb/costume_ideas_for_couples_with_baby.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_fbcdd7a243e74a35923a393f18e73f43.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_398bf4df1c994a86ab218a67a39dc262.pdf?index=true
    • http://fedubumisuvek.epizy.com/folanosanovutatudiw.pdf
    • http://zufimot.epizy.com/pixidozofemetelewotafi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e5.bin
72a0b5d8a87c785763b6004245ba3736f5450fb2910f4fa4069e79d6c893bdca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 5532 bytes
font_01_sfnt_off000104c3.bin
ea4ebdb8cc4efe9950f7c754c0933abd094b852a5594386741134fed6b0471b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 11412 bytes