Malicious PDF — malware analysis report

Static analysis result for SHA-256 743a8885228ce828…

MALICIOUS

PDF

84.5 KB Created: 2021-02-03 22:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d95ad629a8c95c0a3ae3188e0aa5dcda SHA-1: 90187257c95c929bc6493d70a449cfa0d6e7d057 SHA-256: 743a8885228ce8285257051f35adef8d91b3df9e2e5dae4dc26a0276b8d218d6
176 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, many of which are hosted on dynamic DNS services or link farms, indicating a phishing or SEO spam campaign. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/123?utm_term=hamilton+county+ohio+auditor+gis PDF link annotation
    • https://cdn.sqhk.co/gobisofokox/jaR4Wij/sutunupafevoxer.pdfIn PDF document text
    • https://cdn.sqhk.co/pofevadamem/SGflpbl/stick_figure_fights_games.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/fjj4jed/jiffy_lube_coupons_maricopa_az.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5fda83dab1cee.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/ggY8Zhj/history_great_battles_medieval_ps3_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/jnM241e/ganomowusorigaxa.pdfIn PDF document text
    • https://fukukajapojuj.weebly.com/uploads/1/3/2/8/132815924/wolidile-xikuzemuno.pdfIn PDF document text
    • http://segwaywheelchair.ru/bawabt2cye.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/wuzigebedakanuwap.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/hdOkjjc/19060794921.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/TwsghW2/59155237151.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/higfHp8/huawei_health_apple_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/fsnRnvP/lasituguwusetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486971/normal_5fdee83e075d3.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/cb643cdf485f5.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/jjgiiOe/nemajos.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jcZjiV9/last_island_of_survival_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 5416 bytes
SHA-256: 922fc2314001ca275058bb05e5448e44c1a269afb8a037512be81efcae551923
font_01_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 10392 bytes
SHA-256: 036172412fe3a9df30143803a9f8e235d07b80b7523b73e0c6f06707cb5b2ee3

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