Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e81ee2f3e053a15…

MALICIOUS

PDF

68.2 KB Created: 2020-11-20 02:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3149d75f96e15505ee20c39dd7f5d951 SHA-1: 7bad2e0b629c5d586a4387879f3152244fef9a84 SHA-256: 9e81ee2f3e053a150dca54a230783a64ff12a9be540f8c75fe5ee2603d584db4
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' specifically indicates the document prompts the user to call a phone number in a context suggesting a fraudulent billing or technical support scam. While no scripts were extracted, the presence of numerous external links, including one to 'traffking.ru', suggests a potential redirection or further payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=fitness+connection+reno+cancellation
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/910d9.pdf
    • https://mibudixu.weebly.com/uploads/1/3/4/4/134490534/f825cef9847807.pdf
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/ac9b6d.pdf
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/3503835.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejifavo/pickens_county_tax_office_georgia.pdf
    • https://s3.amazonaws.com/kelageketisefuv/72539826126.pdf
    • https://s3.amazonaws.com/degagaziv/raxatokuwi.pdf
    • https://uploads.strikinglycdn.com/files/84a978e0-f670-4025-bbbe-fa0c4e7a4dcb/zufexupixigorib.pdf
    • https://uploads.strikinglycdn.com/files/354331fc-1663-4207-a975-ff8cebc67838/91374929166.pdf
    • https://s3.amazonaws.com/henghuili-files2/2497550859.pdf
    • https://uploads.strikinglycdn.com/files/a95ef00b-ee92-49c4-bd06-28a84b75d47a/23745838250.pdf
    • https://s3.amazonaws.com/muwemivumazulax/dujeli.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/assassin_s_creed_black_flag_multiplayer.pdf
    • https://uploads.strikinglycdn.com/files/edf7c2b7-ae0e-4eba-bb7e-2dcecdee12e6/riwedavarewidixak.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_off0000cd6d.bin
81b065af551a8925fac02ae6d119ca7e1d6ee183a8349f44b1b3e9f0efbd0acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 4748 bytes
font_01_sfnt_off0000dd9d.bin
53ca074667ed69f6a3c544b0d2e0b76d11d650f65b01052422038d65ff37a761		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 11356 bytes

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