Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c71d41fd693407a…

MALICIOUS

PDF

68.6 KB Created: 2021-01-01 04:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0052246518e9da13d4aca634924bb1fa SHA-1: e7b404b5b54cc7e7ce479c803ad0bebca219b6b0 SHA-256: 7c71d41fd693407a899b70ede5021f2bfe01042c68570b94fe8dce57b4d46853
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized content, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=pixel+art+coloring+relaxing+color+by+number+sandbox PDF link annotation
    • https://jelisewisu.weebly.com/uploads/1/3/1/4/131410299/e3fce5d82b35.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/5927702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fcccf2c941ec.pdfIn PDF document text
    • https://wajativakol.weebly.com/uploads/1/3/4/7/134749030/5f0f248c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f9f082bf1177.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/2c78b4ce7a99da.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/nixoke.pdfIn PDF document text
    • https://felepakupanemof.weebly.com/uploads/1/3/4/4/134473623/timukinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_5fd37903528d6.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/genukopapovixo/logo_quiz_answers_level_37_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/definicion_de_estadistica_descriptiva_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/animal_kingdom_episode_guide_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/xda_developers_android_10.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_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 5568 bytes
SHA-256: becd0f8907ed1d6b945afa8ed91af44632caad1bfcd7fd6ce2e61d39c924087e
font_01_sfnt_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 10836 bytes
SHA-256: bf04dea155bfa8b0165b42185c3f3c614cca5d2d1a8e1c44241bb73e76e9e350

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