Malicious PDF — malware analysis report

Static analysis result for SHA-256 106554148a02cb5b…

MALICIOUS

PDF

83.4 KB Created: 2021-04-04 12:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e273d860dd3c9c4899f74bca471dc9b8 SHA-1: a6935d812e710bfa38b9662d8f06b27a053c97ca SHA-256: 106554148a02cb5bc2f7758652b008450053ce2a9f130701ffa75fc2a5d3ae2a
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The PDF structure and embedded content suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

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
  • 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://xezojetit.ru/award?keyword=non+probability+sample+pdf
    • http://zitokujamu.mypressonline.com/urolithiasis_treatment.pdf
    • https://cdn.sqhk.co/nizekidido/0jieheH/fire_red_flying_type_pokemon.pdf
    • http://fofiwafajelerax.sportsontheweb.net/64135670862.pdf
    • http://kajipim.mypressonline.com/designing_data_intensive_applications_csdn.pdf
    • https://cdn.sqhk.co/doxelatofon/gighcD0/rubber_duck_boots_waterproof.pdf
    • http://disetikala.22web.org/pijabolawuxek.pdf
    • https://cdn.sqhk.co/gisepavuv/wjfsQl1/capitalism_pros_and_cons.pdf
    • http://gipogup.sportsontheweb.net/todo_sobre_el_autoestima.pdf
    • http://polobasopika.mywebcommunity.org/bottom_up_approach_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nomamazuzut.atwebpages.com/jomakadizo.pdf
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_1a7d6647e0ec45e0a35bcd489fd346d1.pdf?index=true
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_77200afea20b47a9a9dab0546154c40f.pdf?index=true
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_c6653b30bf6c47f3bc42a10cbff78cb3.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_3243cb2d1b0c4b52a916500461aa0ca0.pdf?index=true
    • http://pigumomibi.onlinewebshop.net/historia_clinica_psicologica_para_nios.pdf
    • http://wipidomi.rf.gd/argos_brushed_cotton_double_sheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf6.bin
4d8d52c1a808ce958f3a8716f4e34f5109d9af6d4045fbd72c0e3bb39ed877aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF6 5188 bytes
font_01_sfnt_off00010c7d.bin
8b2aae23e2eef63971c24650c82424588d2d1f5d76f992a053181de9a8023707		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 11176 bytes
font_02_sfnt_off0001323f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1323F 4324 bytes

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