Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9763445c38831d2…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 17:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23cb32201d66adb6ab4610d7f97567b8 SHA-1: da6a102a7b9574ab53ba15b2a55583f37389a008 SHA-256: b9763445c38831d2f3b293694e17606cccd13ea5732a7125bc8e3ecf2599dd0c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam and callback phishing lure. It contains a mass of external links, with the primary suspicious URL being https://dafemum.ru/strik?utm_term=how+to+apply+for+food+stamps+nc+online, which is likely part of a phishing or fraud scheme. The document's structure and embedded links strongly suggest an attempt to trick the user into visiting a malicious site or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://dafemum.ru/strik?utm_term=how+to+apply+for+food+stamps+nc+online
    • http://zanartcc.net/12113346473v5o7e.pdf
    • http://verenica.net/puvuwou7uxe.pdf
    • http://dezlice.ru/463123729554iv4m.pdf
    • https://fuselenedirila.weebly.com/uploads/1/3/4/5/134597682/d7caf98.pdf
    • http://blablablacar.online/descargar_el_juego_de_la_viboritajhs3o.pdf
    • http://mavitrade.com/botewoxenumeulfds.pdf
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/335102.pdf
    • http://infonewsuk.site/74042077231wi1kx.pdf
    • http://skywonder.space/30724352578rpeuf.pdf
    • http://harkateine.fun/14178051542wakes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeropizuwe/84799240971.pdf
    • https://s3.amazonaws.com/takateg/6992996380.pdf
    • https://s3.amazonaws.com/faxaxos/jobetesexanojuxikagib.pdf
    • https://s3.amazonaws.com/wizedumi/bimebagibivi.pdf
    • https://s3.amazonaws.com/dedinavesute/25388132188.pdf
    • https://s3.amazonaws.com/faluzotixupi/aptitude_reasoning_test.pdf
    • https://s3.amazonaws.com/naxozelozude/41912495394.pdf
    • https://s3.amazonaws.com/tiluwisulepam/luzodoxagubukiraxo.pdf
    • https://s3.amazonaws.com/satudifin/gavujuzaruzezufamopakat.pdf
    • https://s3.amazonaws.com/wutezigojuxi/derivation_of_ellipse_equation.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_off0000eead.bin
6aaa79ae06f37db132c152c82a06af3f838bef02ddd4fb4f29b47185e8917fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5456 bytes
font_01_sfnt_off00010142.bin
0b83709a01878f0d737d3132ef52dca4b8d8cc1175413c30fb639ff7ad46a708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 11084 bytes

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