Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff43cc2ed746eb76…

MALICIOUS

PDF

66.9 KB Created: 2021-01-09 17:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 58deaedc9801d754c70290049b0e7597 SHA-1: a886aca77a9949d28ac389476529c7eeec832c1c SHA-256: ff43cc2ed746eb7639abbe8e995c449a2054169e5af7e0f431ab34b498122a71
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, 'https://trafftec.ru/aws?utm_term=lagu+dusk+till+dawn+cover+alexander', is particularly suspicious and likely serves as a lure 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://trafftec.ru/aws?utm_term=lagu+dusk+till+dawn+cover+alexander PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459164/normal_5fd6eb1964d33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f8ac0ff7e3e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5fee4f12c2627.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376126/normal_5fe4c478035b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366036/normal_5ff79bf06064a.pdfIn PDF document text
    • https://warisizapot.weebly.com/uploads/1/3/4/8/134871943/8361130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471095/normal_5fe620eb82689.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/3935851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_5faed6d61236d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410433/normal_5fe3f228c1681.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/wukevirenesu/area_of_lower_48.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/acura_tsx_manual_wagon.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/55150804360.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/xufefawitirimezalobokel.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_off0000c97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97F 5332 bytes
SHA-256: fb05b465db9a25937fbc275e9fed030eae218131e46e16151a5f6b1c7bda1597
font_01_sfnt_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 10228 bytes
SHA-256: e1ab3de60e00308b6b4830c4309650814847e0b2566af862dadce07490f2595d

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