Malicious PDF — malware analysis report

Static analysis result for SHA-256 794b92478bd7cc8f…

MALICIOUS

PDF

74.2 KB Created: 2021-02-20 19:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2adb61d2662c6ba9fd35cc62ded5c5d3 SHA-1: 80b5b7f450610443e648ac2a8d975161f9e0017c SHA-256: 794b92478bd7cc8f7a181f0b8ea82ad9c9e0ddd709b1a9c6dfd947c4ecb4a7e3
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a significant number of embedded URLs pointing to external resources. Heuristics indicate these links are likely used for malicious redirection, with one URL specifically flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://crophysi.ru/strik?utm_term=how+do+new+moons+affect+cancers In PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/6175178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_6001041bb841c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496380/normal_602eeb32c36a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fc56cce37823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_6024cd180b419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467277/normal_5fcbb986a7824.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/eigi1hb/polejemibufopud.pdfIn PDF document text
    • http://cafe-cok.ru/cbse_class_12_organic_chemistry_notesarm0n.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/MGijcBW/vuzoxunapotufatuj.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/1ACUgiL/92010661102.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/iHbhghg/senior_homescreen_pro_apk_download.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/rudelazifizuvo/medical_terminology_app.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/fcc_15._231_test_report.pdfIn PDF document text
    • http://geperazal.epizy.com/80_ton_link_belt_crane_load_chart.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_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 5188 bytes
SHA-256: 2f5390fb56bf38f289e10f79a7e2ecfed51fb1bd46fd521197bb7faa626d93e0
font_01_sfnt_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 10196 bytes
SHA-256: ba25563175b9bf0b2d3d8a18070e0054dace33433fdc4e77dfab4dad9dee91fe

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