Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95f60a2ec0eddba…

MALICIOUS

PDF

89.5 KB Created: 2020-12-30 17:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1712b1e31e0a31bb9f3d63fb4605c23f SHA-1: 9fdbb031738d09d508bd2f71f74fa923fd35e7c8 SHA-256: a95f60a2ec0eddba812994885e6bbdc24d5ceb95fced009c7bcaa79625c3db0b
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded URLs, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The heuristic firings strongly suggest the document's primary purpose is to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=virtual+reality+2020 In PDF document text
    • https://cdn.sqhk.co/mekizojo/iayjhgg/93125906466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_5fad126e485ae.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/towav.pdfIn PDF document text
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/0fa7857cc9286.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/thjfjan/petty_cash_gift_envelopes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_5f91e9e49f14e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f9c7b5bb8536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fe72f0840243.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/dijimigimigeva_vijexupuduvewe.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/samuwozasana.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/36b33cb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/137f8d6b-cdd0-4f8a-9438-a2e382dfcd50/street_fighter_5_kage_vs_evil_ryu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6816cd52-1c20-4516-810a-28740a7dbe73/13415075438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76af8566-a52b-4891-a109-f157050ebcd5/jekebelumap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 4508 bytes
SHA-256: dca7379867643319d3970bd2eaddd1519919abc30a154c0b1f7fead621994125
font_01_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 10572 bytes
SHA-256: 04669ebe195ee6692b67c96b3c0437dc4eb27ba31f07b04c1abab45a630ec591
font_02_sfnt_off00014a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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