Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b3c51560756ba1…

MALICIOUS

PDF

63.3 KB Created: 2021-01-11 21:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d7e4f69da50a7fbaa8496e057b23dc SHA-1: 79d638ee7f3c03a3ff34b5cd7a2af63c57df6b82 SHA-256: 64b3c51560756ba1805d29f0eb87b0d6b8f298c023708c0f5c1f91606ce3f5b3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded external links, with one prominent URL pointing to 'traffking.ru', suggesting a redirection to a malicious site. The PDF structure also indicates a link farm, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=aroma+arc+2000a+manual
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f964dcdb91c2.pdf
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fdd5d23141ad.pdf
    • https://meletiwupidime.weebly.com/uploads/1/3/5/3/135313264/wogalexigubobutaxog.pdf
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ff4ad5ca1586.pdf
    • https://cdn.sqhk.co/wojinagimepu/ifgHYji/personal_history_of_gouty_arthritis_icd_10.pdf
    • https://cdn.sqhk.co/buzusodova/a1jdgiN/manujexobagafusekidi.pdf
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/fawexopuwomazof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fofeguj/alientech_ecm_titanium.pdf
    • https://s3.amazonaws.com/vaxebisapesi/waguxij.pdf
    • https://s3.amazonaws.com/ruzaganog/home_page_template_in_html_and_css.pdf
    • https://s3.amazonaws.com/kefiperizonofu/21299446136.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc4a.bin
6c23f5d7b78e7d807ae4c79df8ad00f91847792473427b68d961ccba631d9820		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4A 5028 bytes
font_01_sfnt_off0000cd45.bin
24b25daa33bb5dc484918b205679ee521e398a6f49bc286bbea6ea3acb012a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 10420 bytes

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