Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8b5074b95d0225…

MALICIOUS

PDF

62.5 KB Created: 2020-12-25 15:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cfe8ec6d4878151d845e639762be2366 SHA-1: bbacbe25dc2e8d7dd140ec15c6cc71bdc4434593 SHA-256: 9f8b5074b95d0225741a751a79d80a78372d6972a62f42988092864e97e87447
156 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, identified as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, references 'Cuisinart toaster oven manual', likely a lure to entice users to click on the malicious URLs. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=cuisinart+toaster+oven+manual+tob-40 PDF link annotation
    • https://cdn.sqhk.co/wuluzajiroz/Rjhiicp/57490500609.pdfIn PDF document text
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/0440eb.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/wujipifaxojol.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/rupoxe.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/vedesi.pdfIn PDF document text
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/japedudavodopad.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/b9814a01-f0ac-472a-be84-79ae7251e012/62689709540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e9adfa-a4e6-4297-87de-5d862a909d91/ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea55016-50e0-401c-b069-008ab4a27989/boost_jump_northampton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a295f79e-de71-4c4e-a6b3-84a94e2ffe53/opi_pompeii_purple_dip_powder.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_off0000b760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB760 5196 bytes
SHA-256: 84194e3579b364f4adbc582bbc71bedd6be88b97c0a9b33cf10aa8d18e18c31e
font_01_sfnt_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 10772 bytes
SHA-256: a43ec37eecc23bb313f38a9a62b6e1a303ee5d96bb4a9a3739f1dcfc1b6988a3

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