Malicious PDF — malware analysis report

Static analysis result for SHA-256 717fb6f876903215…

MALICIOUS

PDF

77.1 KB Created: 2021-01-12 17:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7ee27c0184a89aa550d4a1d746f17b9b SHA-1: 854f6d3bc32cf4ee827e2be530726edd8aefd038 SHA-256: 717fb6f8769032158cef5e82c8b06f06b8c8639c45158da3c386847e80d9197e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded URLs pointing to link farms hosted on disposable infrastructure, designed to redirect users to malicious sites. The primary malicious URL identified is traffking.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://traffking.ru/123?utm_term=answer+one+communications In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9aef747ee9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f97505f5a36f.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/4Y0ujfP/49281147758.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/9832849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_5faab56dd9b1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459463/normal_5fe209055fe7f.pdfIn PDF document text
    • https://mojipidu.weebly.com/uploads/1/3/4/3/134391160/vopuxixado-fojuso-nokagotexilujok-dunoxigonapigo.pdfIn PDF document text
    • https://site-1211292.mozfiles.com/files/1211292/sowakezawinamefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f97ca110065b.pdfIn PDF document text
    • https://zomonuluxerow.weebly.com/uploads/1/3/4/8/134867862/pezifigutano.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/punurum/charlie_malayalam_movie_in_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/uc_mini_apk_2._3._6.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_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 4996 bytes
SHA-256: 39808dcb6f8cab6eddabfd539d870e8279b3be18aae7c7f1d43b65e5aa28ea6c
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 11172 bytes
SHA-256: 7446a9ff04a63d87aa2dbf2a9e1e0af8e4dd045ebdac0f47dcd43de964dcb9e6

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