Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6de6e51d2fd87b…

MALICIOUS

PDF

85.2 KB Created: 2021-03-18 01:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a79f883bf6cdda65a5cdd6866b21e06 SHA-1: b7c68cac93607858aa33a2c8173b5ccec6318c1d SHA-256: 6a6de6e51d2fd87b364b51439cf197ed7c76c2019d8b07d4aa30265875ca113c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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
  • 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://ponafet.ru/award?keyword=year+3+maths+addition+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379610/normal_600ff770108bc.pdfIn PDF document text
    • http://mebel-albero.ru/gubasituq9n0q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_601dd7ff376a5.pdfIn PDF document text
    • http://senteber.site/252527507128wuvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6020bc4c2033b.pdfIn PDF document text
    • http://hocostyle.ru/how_to_connect_ml-l3_to_nikon_d56005f9wi.pdfIn PDF document text
    • http://fakereweto.22web.org/green_building_design_thesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5fda09aa04337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_60353c2a09b10.pdfIn PDF document text
    • http://antinomi.design/585090733rq2qs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_601d9113a150e.pdfIn PDF document text
    • http://kinoxca.xyz/78741678711ng1h7.pdfIn PDF document text
    • http://faxejurimuzuret.22web.org/69658658419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_2db4d51f2dc540b3adea5189fc72c092.pdf?index=trueIn PDF document text
    • http://fivajopafovile.rf.gd/agreement_of_sale_of_agricultural_land_format.pdfIn PDF document text
    • http://bumerezuwo.epizy.com/fuzikesosowotusalepipe.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_7cacebc1edc24bf5bbebd10791c144f5.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_1eb0a9c88594469e9a11d9e998a2593a.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_26a377d8ae93423d9a2a0426d21787ed.pdf?index=trueIn 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_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 5528 bytes
SHA-256: 3811e579e53d80d95643716e6c53b74268001b8f8a97703c8bd7a01b82aa12a8
font_01_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 11280 bytes
SHA-256: b84d684824951360a58d80bce41d7f3c1a36361cabee76f3ac58e9446c3db128

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