Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43d24cb37493d5a…

MALICIOUS

PDF

61.2 KB Created: 2021-06-12 14:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8a5eb6bf5de4e131a3d4c0275c0af2d9 SHA-1: 2e6370b142325bc0c93cbd969d6bc7527547ffe4 SHA-256: c43d24cb37493d5a983237810a7a34b97c73c864fefaaa35977bc08ff72e7f06
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://garglob.ru/pbw?utm_term=attack+on+titan+season+4+trailer+english+dub PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444377/normal_603f0ba63a924.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/5757439.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/9949749.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/sejuzoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_60b80a866dcd9.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/paxekiwenowilem-bazexixipowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385612/normal_5fed51ad8ec52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_600e88f572a6d.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/lusadupuse.pdfIn PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/5491807.pdfIn PDF document text
    • https://laxepesijuniz.weebly.com/uploads/1/3/1/3/131383562/madaxanizul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fcce9e1233b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_604fd500da2d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fe5608da7532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_605ba70080c59.pdfIn PDF document text
    • https://kasutuwisuruja.weebly.com/uploads/1/3/1/8/131872017/fixupelujuv.pdfIn PDF document text
    • https://korisupugi.weebly.com/uploads/1/3/5/3/135308649/9acb616bc7.pdfIn PDF document text
    • https://dududizenipurij.weebly.com/uploads/1/3/4/6/134651263/1793547.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/9343824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_606617010891f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4527747/normal_60b135f89f73c.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/2ce3275c-ca26-4290-a804-a133ccc3a695/44713056332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2817ac-0d9b-4edc-8074-cb2d2be55fb4/9594468790.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 5480 bytes
SHA-256: 7f42df5b5e5a4c241baeb3d1c1f71a8aac8ab4fa1aaca663eccbb373f889630d

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