Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed01a7d8730bf1a2…

MALICIOUS

PDF

74.5 KB Created: 2021-02-28 20:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 66c6b68bd4ceaa0d59b8e3af7e0e60db SHA-1: 35e26cfdb4dfd3dc01ab73f47cbb2defdc9a2fb4 SHA-256: ed01a7d8730bf1a274b672be1f291bbecad9f0b43d60b2b006bf996c6ed278a6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The primary attack pattern involves directing users to external URLs, likely for phishing or further malware delivery.

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
  • 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://jumiwimov.ru/123?utm_term=what+are+typical+salary+ranges PDF link annotation
    • https://cdn.sqhk.co/tivanosox/gfidijj/9927459039.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/8bd59a513f90a.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/dmYje5L/airport_prg_mod_apk_1._5._7.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/gdhfgg6/16295455876.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/NlqhbMN/panda_carnival_toys.pdfIn PDF document text
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/c81007c4cc06ac9.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/gafukiji.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/dobevafolokuregap.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/Whaghgc/32924877423.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/bzAHK13/17361646890.pdfIn PDF document text
    • https://wegevarudaredi.weebly.com/uploads/1/3/4/3/134356518/4915985.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/lobow.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/8Cc2caz/happier_to_give_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/LqwgjiZ/car_parking_multiplayer_online_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_6000a17b20747.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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5308 bytes
SHA-256: 5de8790d8aa452172729c9b27a946fc5e83b7b18ec953cd024864f0012d6326d
font_01_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 11228 bytes
SHA-256: 170d371ecf18e423b17aada89fa6b0d5608dbce0a06e81137ae5d5016b57e5ab

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