Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3cd166c3f1181e…

MALICIOUS

PDF

86.4 KB Created: 2020-11-19 09:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7c07cf9028465a63de6f93e8833e989d SHA-1: 7d7a7f2869fbd5b057060cb69e9334080d3b4bf9 SHA-256: 2d3cd166c3f1181e79b6f3db781b5a981214fcb788ba36473d061099d6e5b676
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-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://trafftec.ru/123?utm_term=agresti+alan+%25282010%2529+analysis+of+ordinal+categorical+data+wiley PDF link annotation
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/duvijodetan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8748192c25c.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/vakiwusi_zerarupuzapesu_zuxorivikabedok.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/sewebezeput.pdfIn PDF document text
    • https://fabavowugofafif.weebly.com/uploads/1/3/4/5/134591931/6c52c7c400ee.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/raberapisodadodug.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/577395.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/d24923e.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/vururozejetuko.pdfIn PDF document text
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/2522c2e.pdfIn PDF document text
    • https://bevokelas.weebly.com/uploads/1/3/4/3/134310014/ba4788be6bec.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/lilisavawelanakedo.pdfIn PDF document text
    • https://sobegivi.weebly.com/uploads/1/3/4/3/134311910/sulubebuwinumitaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 5852 bytes
SHA-256: ca87715f5a117c0078ab038dc78493be89a80358e5a7329c55737a122de7e6a9
font_01_sfnt_off00012763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12763 10816 bytes
SHA-256: c7245effd03ea6b3bb696e69a368ce5ab175909c018f43b77c7e170d12f82d66

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