Malicious PDF — malware analysis report

Static analysis result for SHA-256 525719b477cdece1…

MALICIOUS

PDF

81.7 KB Created: 2020-11-27 08:21:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c272bd5a8144b956f9c3659ba7dcddf3 SHA-1: 95f5457d93cbfcafcd56f3bb0f8f7a5ba1a21049 SHA-256: 525719b477cdece1cec6ea68ebd28214faffccf0326c1bf59fd5e420a86893ca
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://trafficel.ru/strik?utm_term=characteristics+of+chordates+video PDF link annotation
    • https://sozusodugalonus.weebly.com/uploads/1/3/4/6/134614171/2932066.pdfIn PDF document text
    • https://purowuma.weebly.com/uploads/1/3/4/4/134472698/9449837.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/7102566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5fb340ebf1ffe.pdfIn PDF document text
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/gupumewomevesafanuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5f907dce7fee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f94699a2801f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_5fa59f807a30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f9bdaed2e3c1.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/seximexumam_xobapi_zasegizizufirar_dajegaberokon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385020/normal_5fbc021d700ea.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/83ad8d3c-30a5-4720-b7eb-2f6c08d1ac44/pikaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/zawoduwut.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/7659898751.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/zopirozelaresuwojepabuv.pdfIn 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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 5040 bytes
SHA-256: 1b8868dbaca23ee2d2b78a2ec017fa0cb08e1aa588870901183c06958e165b85
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 10488 bytes
SHA-256: ab0bbc4d84f7877a5ab7261b64df9bc755f31e0eb03106b594cb8d8425804fbe

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