Malicious PDF — malware analysis report

Static analysis result for SHA-256 9710177d7c5c6d05…

MALICIOUS

PDF

64.5 KB Created: 2020-12-30 23:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1afefb6813c3c4d0912df401f7aa278 SHA-1: 7be70eae20fbd1a1a30920a1ba277097b520251f SHA-256: 9710177d7c5c6d05e683f400afa8de1c7a578583371b87827368588f2155399f
206 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the 'callback phishing phone lure' heuristic indicate the document is designed to redirect users to malicious sites or engage them in fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://trafffi.ru/123?utm_term=stamina+inversion+table+manual PDF link annotation
    • https://cdn.sqhk.co/wenudiwome/fhc3ssn/gesevasofesulo.pdfIn PDF document text
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/6ebe6780.pdfIn PDF document text
    • https://sozaruterir.weebly.com/uploads/1/3/0/7/130738534/netinuzukoduponabibe.pdfIn PDF document text
    • https://rokumewa.weebly.com/uploads/1/3/4/5/134529377/14060f4c6d1f.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/gdhejap/87795987900.pdfIn PDF document text
    • https://pobubejafak.weebly.com/uploads/1/3/5/3/135314602/xuwokemo.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/wumojoti-tabenag-zeravazub-rirosirupem.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/8022152.pdfIn PDF document text
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/6601ab.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/fNicjb1/leap_day_birthday_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/wodigajamu/EgiEjbC/super_retro_16_full_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/sghiacf/gsmarena_samsung_s10.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/fr4behe/22090804548.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/djPjaja/lidexewalidebesuluzexepa.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/aJxjgRp/9376468232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edafea6-a921-45e9-8dc4-b450b2caac9d/baxet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 5132 bytes
SHA-256: a750a00f1fd602d9f23084b4b55c48da3f11274a880b5e068b327319050c6bd7
font_01_sfnt_off0000d228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD228 10316 bytes
SHA-256: f195eb8cb7c6f32c2693845c8f8eb367e6ebe47c5feb81eb36672baae8ec53d1

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