Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c858c3b6783a322…

MALICIOUS

PDF

67.9 KB Created: 2020-12-02 16:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a887cca952527de5f3a8378cefc3f6d7 SHA-1: 17405eacb39a66b08fb8118d8278240cacb4e1f4 SHA-256: 2c858c3b6783a3222b316b6a66165287e2ddb08dad0d9625dce4b18ff635b399
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with a critical heuristic firing for PDF_SEO_LINK_FARM. One of the primary external URIs points to 'traffset.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/123?utm_term=warez+bb+alternative PDF link annotation
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/5529980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_5fad631a28fd8.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/wemezedofewejib_subepuluvup_gabemegadogo.pdfIn PDF document text
    • https://molegogadamo.weebly.com/uploads/1/3/4/3/134341439/4434275.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/vubuzabujiludamuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_5fa8e95aace31.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/jazefiwoxelo_moxesolikumu_jiwevudon.pdfIn PDF document text
    • https://rodefakuwutepez.weebly.com/uploads/1/3/4/3/134341390/6687270.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/1223302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53bc9b1ed03538d1d66e/1606374333582/google_girl_hackathon_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cad1f7cf8c754043c6f3/t/5fc6a6b52dd96f5918d81b16/1606854325603/speed_70cc_motorcycle_price_in_pakistan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb332bbd740658015355/t/5fc4f74861e25426e1d3bff5/1606743881750/zabinobu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf51408845d09244fa3c8/1606284567823/blessing_of_the_animals_day.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0672f60f2895dc1e54ab2/t/5fc22ab54e98326c02594b5e/1606560439946/best_buy_near_me_santa_monica.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_off0000cfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 4764 bytes
SHA-256: bb3d18a97a32c5f6781ce5738e420195fdae8ad45521956a9eccd3398b348369
font_01_sfnt_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 10096 bytes
SHA-256: 595f138858e97152d55ebc038b1a1cfd6dd75801d97e793d4a9206c2d59160ac

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