Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7b58d4e5bfdf8e…

MALICIOUS

PDF

74.8 KB Created: 2020-12-22 17:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f546ce0a91bf8e7dd3f9ddad3c3b0d37 SHA-1: 1c79a306d16e2cd7b125b566d3f3f482626bc007 SHA-256: be7b58d4e5bfdf8edf95decfa8879e20530d22251a33467a9901aed91f962f2d
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to a known malicious domain and a link farm containing numerous external PDF links. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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
  • 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://cctraff.ru/strik?utm_term=itopride+hydrochloride+usa
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d5b0be1e.pdf
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5fa1e84f96422.pdf
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/4517033.pdf
    • https://cdn-cms.f-static.net/uploads/4477408/normal_5fc15dcce6986.pdf
    • https://laxozutamof.weebly.com/uploads/1/3/4/7/134748247/2fd35.pdf
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/4773380.pdf
    • https://pagowabelada.weebly.com/uploads/1/3/0/8/130874520/zumerenulusijapul.pdf
    • https://xokuriwuboteze.weebly.com/uploads/1/3/4/6/134663839/1405198.pdf
    • https://wudizibi.weebly.com/uploads/1/3/4/4/134477582/jiduf_vafivokopow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5bfca33d-363a-4f9d-a2a1-884127bea374/calculus_single_and_multivariable.pdf
    • https://uploads.strikinglycdn.com/files/97d53479-c8de-43fe-9a82-0747aabe1e0b/rue_cases_negres_film_complet.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5ac7f81c9a2a0c995ce5/1606376136792/worksheet_mutations_practice_answers.pdf
    • https://uploads.strikinglycdn.com/files/bba774d8-c6a4-4a11-8593-df95086b2741/87248031346.pdf
    • https://uploads.strikinglycdn.com/files/bbed3480-8b0d-46ca-995d-f003c2bcd79c/54776182771.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_off0000e7bd.bin
aaf279ad59b6d302a35de2f8f2601cf984237eb4b8df273ceea378e32af8c2c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 5200 bytes
font_01_sfnt_off0000f96c.bin
5e01260fef8a0b0e3415e5b19d7b5f015a79d8675e80202c43bdafaec12c5a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 10972 bytes

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