Malicious PDF — malware analysis report

Static analysis result for SHA-256 81150d23f4e44988…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 00:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8fbfc58c3609b10f9fc900c23cffa031 SHA-1: c8d312317c592218f8de552e6b6eb9096afbc15f SHA-256: 81150d23f4e44988f538f3ee96be5ed4235db660723acac70aea2f504276d9eb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. One of the primary external links is to 'traffine.ru', which is likely part of a phishing or malicious redirection scheme.

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://traffine.ru/strik?utm_term=isotonic+solution+definition+class+12 PDF link annotation
    • https://tezosarotijup.weebly.com/uploads/1/3/4/3/134305137/vexuta_tavogafezamakid.pdfIn PDF document text
    • https://fuguxowaponiv.weebly.com/uploads/1/3/4/6/134648792/rafubusimigafi-maxesaga-tadudotovib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f9094f62ae63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_5fbce88ac7a2c.pdfIn PDF document text
    • https://likixulojuxe.weebly.com/uploads/1/3/4/3/134386003/peviwiwese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fb5e9b5260d0.pdfIn PDF document text
    • https://fitarobut.weebly.com/uploads/1/3/4/6/134690469/jetisemanu-nulawesexidof-jamotow-refunagutepoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_5fd9004f78864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8ec26c04bee.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/c0c4fd4a-d27c-4f0c-bb07-1c71c2af893a/pezevijofikonorewusij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab52ee0-0e17-4e68-9b48-cf9d8837bc91/187000436.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12a77be9b6939510c7598/t/5fcf9e2b7379aa35977fab8a/1607441975314/storyline_online_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a30309-7aa0-4327-a75f-824e74611987/zawijedozifimitumun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e0e222-6d70-49ff-a6d7-4d0dcf6894a4/english_paper_piecing_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830a1819-c920-4f63-b498-dc638c335644/raxagofat.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5add9f9866f3fd2f487b8/t/5fc881ff46ef2e08cbb7ff6b/1606975999658/63304830493.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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 5040 bytes
SHA-256: 70733f8018b344f2a286cce0b0a0a7d1d49a3118520c3376d70ab2b937595f37
font_01_sfnt_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 10804 bytes
SHA-256: f4fe7439fea40881802426a8ee001b6aa158895b796d240c72602fddba8fa16d

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