Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29a53bfe2b5c613…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 01:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 41b0622689d299fb71b3deefe94d3722 SHA-1: 460842644c58db67c27c8c892e28b8a66a592fc3 SHA-256: a29a53bfe2b5c613c54e1cc626551d8c7b8958ad5ca84a4ae99ddd4214cc0aaf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicative of a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the sheer volume of outbound links suggest it's designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/wix?keyword=complete+guide+to+machine+quilting PDF link annotation
    • https://cdn.sqhk.co/moxibusas/fij5ick/survival_rate_of_colon_cancer_stage_3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5fef03d63f5f6.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/hU5jbhd/66466160250.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/dhaehSJ/fejaxupakeva.pdfIn PDF document text
    • http://pozuvixa.getenjoyment.net/98799908255.pdfIn PDF document text
    • https://cdn.sqhk.co/bimepefav/hgehbaf/91859625462.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/7863638.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/iiBEaig/77927271451.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/XsKPBid/piggy_boom_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/41aeihU/63169402540.pdfIn PDF document text
    • https://cdn.sqhk.co/wigalefu/jjgIiaX/buruxiwujijezizozo.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/6970478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_601dfbf88d36e.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/cijgiSy/e_coli_symptoms_in_urine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_6019822469db3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/73743548290.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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5244 bytes
SHA-256: 5b04bcddb7c9b6f2e71bb55141dcd65d8a8212a065a8afdb91ebc446b1e6bf89
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 10456 bytes
SHA-256: 9d0f11d7d96689ad2b8e63ac04f028566ba8b871be0358d6e16b20a4fa7db0b6

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