Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ff8a8d6f8b13c4…

MALICIOUS

PDF

66.2 KB Created: 2020-11-23 12:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b17c0cc4e434556e2de41363907d65a8 SHA-1: 065fc37330ed401d8b2e3846477ea4ba309c8aa0 SHA-256: 85ff8a8d6f8b13c4a1526a9c8c9108ea8461a5341993e8bd45486256a2708246
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://trafftec.ru/strik?utm_term=garageband+free+download+for+android', is presented as a lure for free software downloads, which is a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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=garageband+free+download+for+android PDF link annotation
    • https://zobirifojufegot.weebly.com/uploads/1/3/4/3/134374070/kajeperem.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/loxelirovisa.pdfIn PDF document text
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/3521723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8924eda1c95.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/texosibeli.pdfIn PDF document text
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/tonop-bomogawaw-forozimutexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5faa290fc1e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f9c6b06ec60d.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/pazifetanegapu/mpm_accuflex_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458069a9-c2b2-4bdd-9513-f12ee7cab2f0/29369664389.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/lepadodigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3264b37-2a40-45e7-ae8c-6acd50424752/9942998177.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/ucla_social_sciences_computing_lab.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sixekifulojidebij.pdfIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/leduwevuxugepopime.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_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 5160 bytes
SHA-256: b19ea08763a732d58ad69f0eb38c04ec8c2c45c2548fe4720a1d6c47c1c5f667
font_01_sfnt_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 10176 bytes
SHA-256: d3769833757a07073b219165fc8b98efc043830eb8229a1d1683e6859b2757d4

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