Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76fc3ee2f586e47…

MALICIOUS

PDF

69.1 KB Created: 2021-01-23 14:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3527346f146a865003c0a17c527e4e99 SHA-1: eaf64059badf23bf42c33c7653c701c247115edc SHA-256: e76fc3ee2f586e4766e9c5d457a0d24190510c5202296c5319ecc5fa2799db56
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a link to known malicious redirector infrastructure further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=fastest+horse+in+rdr2+online+reddit In PDF document text
    • https://cdn.sqhk.co/terexugureto/fJujeK2/winijanikaje.pdfIn PDF document text
    • https://site-1206121.mozfiles.com/files/1206121/samurai_jack_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5ffb51b339e34.pdfIn PDF document text
    • https://site-1172629.mozfiles.com/files/1172629/nasutobuzepanelojefodob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fd7d728c30d9.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/m5Ahagg/nefegozo.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/IKijicV/87013571580.pdfIn PDF document text
    • https://site-1176018.mozfiles.com/files/1176018/givuwamumitasepiz.pdfIn PDF document text
    • https://site-1177566.mozfiles.com/files/1177566/ringtones_galaxy_s8_plus_screen_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/kivuwutu/bK9Lmjg/jiwabekuzikaxavasujataxaj.pdfIn PDF document text
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/b03a8c96.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/werowibovezoje/kazugijujawugokokomal.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/33507570497.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/makovatizaxoxomazun.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_off0000c7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D8 5000 bytes
SHA-256: 1101bb7005fbc247320863a9cec5334d1093066b3c5e13db0a605ee28ba46172
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 14580 bytes
SHA-256: 26ea32a3efb45d34b39a92de8df8a03fcb3d2cd13bc1d3f517fc52ee3c3a6c39

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