Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3561bdd8fc91238…

MALICIOUS

PDF

61.7 KB Created: 2020-12-14 03:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: da8c1974ee1e105944752a0db25a14e8 SHA-1: 67e84f44a13b3e9617fc5428cbef38703f50c880 SHA-256: a3561bdd8fc91238670acde1441a38dd6356ad12d18be8e4cf4a91a9756c2745
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a redirector link and part of a link farm. The embedded URLs, such as https://gettraff.ru/strik?utm_term=cs+164+berkeley+reddit, suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=cs+164+berkeley+reddit In PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fc87e4cb3461.pdfIn PDF document text
    • https://wusaworapivuwor.weebly.com/uploads/1/3/4/6/134659128/9883592.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/pisafolisamuwa.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/kutapavug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f870bec297ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fa1e1916c4b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_5fa653499bf16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5f96c417be2ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445125/normal_5fb2b549d758a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/bokagumejaxewetudidimisat.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/methodology_of_air_pollution_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/bas_rutten_workout_review.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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 5112 bytes
SHA-256: 6f93a10f61910b7c454d7dee8a3f7f971607adfe2958c8fdda84dc10504c8148
font_01_sfnt_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 11384 bytes
SHA-256: 5380eb2cbe3d331b581644d566bdc73a91a6e5fd0c6e9cc40bdcc5b16b7bfd52

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