Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f428cb02e70a8a…

MALICIOUS

PDF

68.2 KB Created: 2020-12-22 19:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4ae23f1cf04a07177425b41419da394b SHA-1: 2d4623f200f13b29a65c2b5a54969be9782a7dda SHA-256: 79f428cb02e70a8a87f2d9d2901fc4413e8fcb1e844f3006864251c40147dcac
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://trafftec.ru/strik?utm_term=voicethread+app+no+sound'. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=voicethread+app+no+sound PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413714/normal_5fddde73e9acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388818/normal_5fb260f1a0783.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/9772577.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/0efc6a821.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/a2671.pdfIn PDF document text
    • https://fonilukixegob.weebly.com/uploads/1/3/4/8/134884535/ninof-vovolixina-lowidotupor-budomigeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fbffe61bf71053ccb0b2b06/t/5fc4dd8c3c6ccf69f3f7825b/1606737293303/recycle_symbol_6_microwave.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc156cb173fb5383bd47724/1606506191323/rawotikunin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf3368bc8713fe6fccfec/1606218557256/kipov.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf2db271f6413cf54442cf/t/5fd6da367fc52c206936d6ca/1607916086954/free_bible_king_james.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff35066-6cbb-4f1e-8d81-94725b45b4e9/taleropatojezuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afce7d47-3c96-46c8-a735-f724a91d1358/cable_one_prescott_az_channel_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15E 4976 bytes
SHA-256: 65edd322bf1777ab3ae0bdb24b611da7e4627da591f5536612246ca2f35978b8
font_01_sfnt_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 10572 bytes
SHA-256: 0cb6cea218f4a8e34c7c736ccdc08afa181793907e7496168ac9eaf43d76f579
font_02_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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