Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8c0295eee36aa0…

MALICIOUS

PDF

56.3 KB Created: 2020-11-06 13:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a0958ffc210e0cc1089664f1fe06b8a7 SHA-1: 5a537622735c0083f0e5c4e2e5d12a01b4c65f5d SHA-256: cb8c0295eee36aa0a68ff5a8e4c7f9bc367bfbeb2c5c8b7aada2e547f3d48378
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains embedded URLs, with one prominent URL being https://trafftec.ru/123?keyword=cbm+study+guide. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'cbm study guide'. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect the user to a potentially harmful site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafftec.ru/123?keyword=cbm+study+guide PDF link annotation
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/riruruwixowexad.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/bobitukefib.pdfIn PDF document text
    • https://rokumetusemep.weebly.com/uploads/1/3/4/3/134382705/6ce314.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/legojawebozigib-kututoluso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/vomoresusawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a95a78d-c240-46be-90dc-0e73244ba9d1/78897468703.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/analytical_solid_geometry_dipak_chatterjee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfddcc2d-2aa2-4f56-a56a-13b8a31a706a/porog.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/lovense_lush_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba02f1e8-498d-4986-a925-5c97d73ad8e7/bapukorusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e7e9bf-c05b-4997-9b47-cf31987222f9/75544871083.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_off00009e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E71 4952 bytes
SHA-256: e28e1959b96c8160b6df25a719fa0916a5576200da7e34358844994f7d546b91
font_01_sfnt_off0000af3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3F 11200 bytes
SHA-256: 42746aa41c4fb56426442353ed997a6770446407ee1a5c2868547bb801abed50

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