Malicious PDF — malware analysis report

Static analysis result for SHA-256 86662a1afd32eb01…

MALICIOUS

PDF

72.8 KB Created: 2021-02-17 15:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 19042a5d058d83917bdfdf28f261e1f5 SHA-1: 841dac63acc9e1827489bec0b591527c12c1bef2 SHA-256: 86662a1afd32eb0185ce70be1abcadb9b0effa9ef66d7b41a13eaaf4dce50a11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=d%2526d+3.5+cleric+domain+guide PDF link annotation
    • https://cdn.sqhk.co/jotenitix/jnha0zG/stickman_3d_racing_popular_3d_run_games.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/jDphcsL/ninja_air_fryer_grill_accessories.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ehjijid/xoroxewijekavuxabepal.pdfIn PDF document text
    • http://sipamuxagiporen.iblogger.org/counter_strike_condition_zero_online_play.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/0NQ5kgc/javuganagisafewikajewujij.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/gdfKieu/roku_stick_amazon_prime_app.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/dVkgigd/hard_boiled_egg_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besuwodusibix.rf.gd/office_2019_professional_plus_mac.pdfIn PDF document text
    • http://xediguvodolej.epizy.com/slope_intercept_form_through_two_points.pdfIn PDF document text
    • http://gikinegakotij.epizy.com/rozot.pdfIn PDF document text
    • http://gejaliwujabe.epizy.com/35228137500.pdfIn PDF document text
    • http://fuxufotab.epizy.com/resume_for_teacher_job_application_format.pdfIn PDF document text
    • http://zejagal.rf.gd/87204714180.pdfIn PDF document text
    • http://zuvojiveko.rf.gd/pizepavo.pdfIn PDF document text
    • http://widurema.epizy.com/81452994105.pdfIn PDF document text
    • http://nalujisutu.epizy.com/bootstrap_3_form_control_error.pdfIn PDF document text
    • http://zenujasope.epizy.com/repugenudufe.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_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 4156 bytes
SHA-256: 3c306e0ec94285d13e87c04bb9d91e20e74eae243bb960c666b01ded030faf74
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11172 bytes
SHA-256: 6f43f5194d3fd3c12cc64694388069bf7f407ad64e48ae6a85ac857e8fe53582

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