Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0f03845ff8f195…

MALICIOUS

PDF

73.1 KB Created: 2021-03-03 21:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 736486345e80440519fc1ed72ca248ed SHA-1: ad1ec5698383fa4f7326ae0a12a6597f8dc6599b SHA-256: fc0f03845ff8f195979d7128e0a7fb3f5552bcfd5ef49a09fd2617ce6c73b79d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=garmin+nuvi+265w+battery+replacement PDF link annotation
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/lujesapejasiguvareb.pdfIn PDF document text
    • http://espaceclient-cmb.com/stick_war_empires_3_hackedsqrio.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hahaMic/cowboy_bebop_episodes_total.pdfIn PDF document text
    • https://zuxizakubapepo.weebly.com/uploads/1/3/4/3/134317428/newun.pdfIn PDF document text
    • http://studytogether.fun/what_is_self_managing_in_caredlozz.pdfIn PDF document text
    • http://jigitozunawada.66ghz.com/invicta_watch_battery_guide.pdfIn PDF document text
    • http://biggymstoe.com/fezexinean333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kevatudoritek.rf.gd/ap_chemistry_acids_and_bases_test.pdfIn PDF document text
    • http://minapisifiret.rf.gd/zixonewakazudukenubalifaz.pdfIn PDF document text
    • http://gamemogap.epizy.com/using_slicers_in_cognos_report_studio.pdfIn PDF document text
    • http://tinerulekivu.rf.gd/8209814998.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/australian_passport_renewal_application_form_overseas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 5508 bytes
SHA-256: b2e4e2c89b53d1d0b8397c1b291bd3fbab26febe8f442a59c06e788e20c9f4c9
font_01_sfnt_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 9908 bytes
SHA-256: b7809d8248f3fe8eff78a163aec29cb7f3127b0570c17b90ad74df61659c5dda
font_02_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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