Malicious PDF — malware analysis report

Static analysis result for SHA-256 0320cf62851a1a4c…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 08:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 841c104151c7c52f078110af356753c3 SHA-1: 7be8f7334f0a3b89e82425d836a61f666366e67c SHA-256: 0320cf62851a1a4c3e21a3fbc07bc753d367e0c606853971ceffbbf309b1937e
184 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it's a redirector to known malicious infrastructure. Numerous embedded URLs, including one pointing to `yafferge.ru`, suggest a phishing or malware distribution attempt. The PDF structure and link farm characteristics further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/award?keyword=beowulf+pdf+new+english In PDF document text
    • https://cdn.sqhk.co/fawabanof/TOUC6KY/bathroom_radiant_heaters_wall_mounted.pdfIn PDF document text
    • http://jujavekerubeko.scienceontheweb.net/20187962275.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/madomulavalo.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/cpjhRql/10444381048.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/dodolirejukobonujopedi.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/hcjbp4a/honda_gx160_engine_parts_manual.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/53675932350.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/60890057566.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/45989617476.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/konflik_ahmadiyah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06918b0-572a-4dc5-8ec6-174fceea4772/what_is_zero_dipole_moment.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/pain_gate_control_theory.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/gulareniliwot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbecf034-d3bf-4fe5-bac0-93309e61fd0c/khan_academy_free_sat_practice_test.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/dajezokezipawaketip.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/kali_linux_tutorial_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de98b52-f137-4165-80d2-ee200cb04835/61236429638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b439569c-9107-4f8d-aaa7-339c465f4492/what_is_the_summary_of_twilight_new_moon.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/18831212781.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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 5140 bytes
SHA-256: 7c567da42c4132222ede08152371195ad335d545d54efefd113b0272fafeb28d
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10940 bytes
SHA-256: 68be54d0e9238442dae9745a75ff4f21170b8e98ed5695fdf52a0705993baa64

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