Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccde61fd01f76e9…

MALICIOUS

PDF

77.5 KB Created: 2021-01-01 07:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a6170f172cd13e7f532a0853f6889344 SHA-1: ed368c227fb30ffd9540441d8af3b6a8b4516f49 SHA-256: 3ccde61fd01f76e98ca7a98953ba7fb521bb827de54fd84c2d19dd7f6dc70364
244 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs, such as 'https://cctraff.ru/strik?utm_term=offroad+car+driving+for+pc', are flagged as malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=offroad+car+driving+for+pc In PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/lufagabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_5fb410e487d7c.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/6143331.pdfIn PDF document text
    • https://rufijaduruki.weebly.com/uploads/1/3/4/3/134311805/2478905.pdfIn PDF document text
    • https://cdn.sqhk.co/godivago/cjcghEm/19279071931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f8bc578950f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f99c50faf0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_5fa8e1995b2bd.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/tufinavasujir-gimemi-kunekore-fegekobarojor.pdfIn PDF document text
    • https://cdn.sqhk.co/jasowipe/Hxpggjd/commuter_benefits_nyc_login.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/hagglDp/my_pcc_d2l_direct_login.pdfIn PDF document text
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/1d7f4f.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/65299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 5200 bytes
SHA-256: b52e67406a621a492f5b491616855d83b5141807bd1ef1c78c3e0f795bd1f10b
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10636 bytes
SHA-256: 2270153e8d769ee129d6ebde8ec46ca3ef353902ec89a374e6dd51addd862867

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