Malicious PDF — malware analysis report

Static analysis result for SHA-256 442b73091cecffd3…

MALICIOUS

PDF

63.9 KB Created: 2021-06-09 03:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5a54200f7aa51f83abcf1961777ae08b SHA-1: 00541e325b73ddc9b0c8794a0272ffc5d998d8bc SHA-256: 442b73091cecffd37bec90a125a05bd3fe49a7e865b635f335cd54b4ca228d53
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9263

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pawn+shop+prices PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412154/normal_605bdd3c12a67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_606022816d9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_5fd738a42d1ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fc911d666942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_604fd113461d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6029ed6bdd522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6050ee5950bc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490936/normal_60089c75a1201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_6046adda56bd0.pdfIn PDF document text
    • https://jetireduru.weebly.com/uploads/1/3/1/4/131453335/jofasamax.pdfIn PDF document text
    • https://gewopisoxow.weebly.com/uploads/1/3/4/3/134306678/lomamurikot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425227/normal_5fffa3c08fdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6014a53d1fb08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_605aac22338eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443608/normal_5ff81e4a853f2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426090/normal_60b1e881d74a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384831/normal_601d2371aaa9c.pdfIn PDF document text
    • https://xekumubuwufalag.weebly.com/uploads/1/3/5/3/135345963/7441224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fd085df936c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefobukeza.pbworks.com/f/28066446838.pdfIn PDF document text
    • http://jufugoxula.pbworks.com/f/ibm_spss_statistics_23_free_download_64_bit.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144747351/88778014562.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/samsung_bd-jm57c_wont_turn_on.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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5080 bytes
SHA-256: ae2b67db67393bfe7b0b311ffac1243148991381af40606f00242d44760357f3

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