Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c3551d7048503c…

MALICIOUS

PDF

75.9 KB Created: 2021-02-22 12:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0229d6f97997dcebda516b7f282b4c19 SHA-1: d46d035fffa2369f626e876eaf411a891abb2fb4 SHA-256: a9c3551d7048503caf1fd61bcafbf9d82f504881ec23b3ba18b3446c6b6b10df
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=what+is+the+meaning+of+chinese+laundry PDF link annotation
    • https://gavurefeg.weebly.com/uploads/1/3/1/0/131070452/jewurivafo-vejefoz-sereb-xevesatod.pdfIn PDF document text
    • http://zaduzoronogikex.22web.org/fuwanigulupejiralupukure.pdfIn PDF document text
    • http://rebituzugofebo.22web.org/what_is_a_capacitive_voltage_transformer.pdfIn PDF document text
    • https://mevesazikixewo.weebly.com/uploads/1/3/4/3/134366921/b8117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fd75f3e992d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_600ba46e241b8.pdfIn PDF document text
    • http://lekisemutiwoxug.22web.org/craftsman_garage_door_wont_open.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/tolafitigipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevisub.rf.gd/vuvajixavebu.pdfIn PDF document text
    • http://sufumawug.epizy.com/superman_vs_batman_game_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/61916621408.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/voxelebujagegifu.pdfIn PDF document text
    • http://sevakerasafa.epizy.com/formation_administrateur_systeme_windows.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_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 5548 bytes
SHA-256: 827d4a8a3155f485b65f9ac8a2efc22b2705835817c4bfd2b2ad2c59d68002b5
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 11332 bytes
SHA-256: a8f0152fc80549f80383be5e7315078fb3fe14d19ce9549f9412aa7b8e698025

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