Malicious PDF — malware analysis report

Static analysis result for SHA-256 214bb31d7e25d86e…

MALICIOUS

PDF

66.3 KB Created: 2020-12-09 04:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31c6bdb4c89825c54c9e5db6ff5010ce SHA-1: 283dcaa20f83473861caf47f7278a4643d1bebf6 SHA-256: 214bb31d7e25d86e9a7db19bd870d42c6741bd654cec4214fd90379aadfdea87
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to various external PDFs, likely for SEO manipulation or to host malicious content. The primary URL, https://trafficel.ru/strik?utm_term=biblical+mathematics+pdf, suggests a phishing or scam pretext related to 'Biblical mathematics'. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

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
  • 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.
  • 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://trafficel.ru/strik?utm_term=biblical+mathematics+pdf PDF link annotation
    • https://nofexozodaxo.weebly.com/uploads/1/3/4/5/134522082/9702005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_5f966830c83fc.pdfIn PDF document text
    • https://legifufase.weebly.com/uploads/1/3/4/3/134349809/819950.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/453043.pdfIn PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/kirali_gigimugida_kofowifewetitiw.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/2486279.pdfIn PDF document text
    • https://jeburetuzof.weebly.com/uploads/1/3/4/3/134306955/sonok.pdfIn PDF document text
    • https://jopomewimedadi.weebly.com/uploads/1/3/4/4/134465277/taxadumekor.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/5fc0baa35687f52b6b804624/t/5fcb1b1c64036b614387c40e/1607146269535/11193700672.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/free_llc_operating_agreement_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6cb37f2297e36a9fa3dd4/t/5fcc1074978da30c56eb2db1/1607209077510/dufikudiduxajojepapulamo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/mario_kart_7_unlockables_list.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc011b424b06a7eb3fa7d30/t/5fc0e1225147b14804540d61/1606476066368/liberty_high_school_bedford_va_yearbook.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 5488 bytes
SHA-256: 5924ddda7ee0e8ff7f859f8164f318896a8a43ec080336c750541fd9c553e0c4
font_01_sfnt_off0000d925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD925 10520 bytes
SHA-256: 0c222eb721f3a2e539c3c385823efa10d8efdfc7bcdffe07b0499c23dbcfa8b2

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