Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea9f1c1b85bf069…

MALICIOUS

PDF

64.6 KB Created: 2021-02-15 16:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6046c8858999d1cf3dfb2a8f3fbfd41d SHA-1: 56aaf5de2ba9aba5a05e1d4732ea066d386a8c93 SHA-256: 8ea9f1c1b85bf0693df945defcf8c5a7d9f28ed3a8927d94d3677367c1d0e522
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 domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards luring users to external, potentially malicious, sites.

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://seumenha.ru/123?utm_term=homedics+clock+radio+sound+machine PDF link annotation
    • https://vudelugofede.weebly.com/uploads/1/3/4/3/134383428/sekibo-natekivef-bisen-didebu.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/dfd5e219077b9.pdfIn PDF document text
    • http://gdztut.com/kasavugap3eoo.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/fIjahaJ/oppa_doll_full_unlocked_apk.pdfIn PDF document text
    • http://1xbet-football.fun/94679249424pl1ai.pdfIn PDF document text
    • http://vereffka.xyz/extension_adblock_para_androidwibkl.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/7284003.pdfIn PDF document text
    • http://hihikane.space/sony_cdx-gt450u_user_manual527h6.pdfIn PDF document text
    • http://torchland.xyz/brief_principles_of_macroeconomics_8th_editionyl2fg.pdfIn PDF document text
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/4821838.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/af3f5.pdfIn PDF document text
    • http://medyayazilimtr.com/free_printable_english_worksheets_for_4th_gradersa94lv.pdfIn PDF document text
    • http://rukozhop-guide.com/fulanamimazudekafxxkt7.pdfIn PDF document text
    • https://cdn.sqhk.co/vikeguzag/9gjhgDP/luropenaromasup.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jbih4ap/adventureland_iowa_new_roller_coaster.pdfIn PDF document text
    • http://ilkertr.shop/61132150997pnbvm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nizalag.rf.gd/anydesk_for_ubuntu_17._10.pdfIn PDF document text
    • http://vosivoru.epizy.com/5868425316.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_off0000c0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CF 5204 bytes
SHA-256: a001de253f53a0f4b9305883127c09a0fe0689a8b67f67dc2879d41d8da445e5
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 10188 bytes
SHA-256: 976d00b717ee8baba2f004d8d2487eced17c400e2239b9b442496967dad6d593

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