Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb7515f727f2ac8…

MALICIOUS

PDF

71.6 KB Created: 2021-02-12 16:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 34a09ebc4f42b1b54523fb09f5183042 SHA-1: 28e672c4a9165d3afe60afa509e7ae208985b894 SHA-256: ddb7515f727f2ac8e5d65d851442008fbbd8a4410dd30be40b5f4ec6abb19828
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized URLs, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a deliberate attempt to create a link farm for SEO purposes, likely to host malicious content or redirect users to phishing sites. The presence of ClamAV detection and ML classification further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/wix?keyword=instep+quick+n+ez+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459791/normal_5fd81a14ca74e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369189/normal_5ff22e21a8fdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451035/normal_5ffa58d450b6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500677/normal_60134eb2a0fe6.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/jhhcagg/black_widow_avengers_assemble.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402280/normal_5ffc2e0d1f009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468554/normal_5ffdc8892ec55.pdfIn PDF document text
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/rufebo.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/149642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494661/normal_5ff135a79861c.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/538828.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/icNggdX/rujofevipevumemuxarogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judilawazawu.epizy.com/xobujelewu.pdfIn PDF document text
    • http://xeziribosivamis.epizy.com/wofozakesokorewonupek.pdfIn PDF document text
    • http://bufivuz.rf.gd/96586372220.pdfIn PDF document text
    • http://mijugavagi.epizy.com/autocad_2013_32_bit_for_pc.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 4860 bytes
SHA-256: 10a9b2f58a0a95b27b9528c1b89c5ff340ebb2ce4d561c470cbe07af613725a0
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 10448 bytes
SHA-256: 4e2f922c033ed7741e86087c217a459edeae30a681bcdce1866f5b9ecb649460

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