Malicious PDF — malware analysis report

Static analysis result for SHA-256 729a2682736fffac…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 06:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 91647b9c439c18debc08728b9365cd88 SHA-1: 16c2912821079cfd443ec711e9daa61e658808f2 SHA-256: 729a2682736fffac55a884ae8a95b39cd4e5ce3d69983e2914ec0a19fb9f71ab
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 0.9999

Heuristics 6

  • 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
  • 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://leonvi.ru/strik?utm_term=common+themes+in+literature+8th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419818/normal_60167f3a55c8e.pdfIn PDF document text
    • http://zexorusawuwurew.sportsontheweb.net/kakafofuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5ff7618237d01.pdfIn PDF document text
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/5027065.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/a7ae2f505371ee.pdfIn PDF document text
    • https://xoxisutebigag.weebly.com/uploads/1/3/1/4/131453062/7c07d.pdfIn PDF document text
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/1342524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_60446e77c6293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5ffe7cb7d1d8e.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/litamezisava-munini.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/tipiponafososegisupafafaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ffb663b4a192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_602c4d2bbc9a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_6035ab35ef595.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_9bb97467500e440eb34b256b2f3dc490.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_7d3bd95b4273480d9996b4fc29a48995.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_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 5340 bytes
SHA-256: 87caa0ed35d8d86c647b4fbec889dacfaddf968481217eb37c9616d5d3bf6575
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 10888 bytes
SHA-256: 2aae4a36dc854e82d0c0fb0d692d702032b72a32ee1dea829c25f0e945cd6b1b

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