Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7a6128c4b654ed…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 05:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0693c497f6918bf14f355743aa6a324 SHA-1: 807f8043f09b8bf69581610cb42ff5ffedaffdb0 SHA-256: ae7a6128c4b654ed07dac8486e94e16009da823390895aac9e2e930a75f4f529
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to potentially malicious content. The primary external URI, https://vilenefex.ru/award?keyword=tratamiento+de+absceso+hepatico+amebiano+pdf, is likely part of this scheme to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/award?keyword=tratamiento+de+absceso+hepatico+amebiano+pdf
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/nifidasokerabodem.pdf
    • http://xukosususif.medianewsonline.com/55636250198.pdf
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/1345910.pdf
    • http://konalofasu.mywebcommunity.org/best_table_topics_award_certificate.pdf
    • http://larokamexi.sportsontheweb.net/faringoamigdalitis_bacteriana_2020.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/5113430.pdf
    • https://lisebozaran.weebly.com/uploads/1/3/4/6/134694889/4894dd4a1072.pdf
    • http://jizerigozigalav.getenjoyment.net/blues_scale_chords.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_2b423b291934413da17d7399cf87a63e.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_6673f29532314cd09381639cf151d833.pdf?index=true
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_04b449c925ef455fb6bc6c736b4abcb3.pdf?index=true
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_c23d2164c5c941388fba3ebcd8f961f7.pdf?index=true
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_5312e22638fb4cce965adb2663d72968.pdf?index=true
    • http://dexizijisub.atwebpages.com/lizomosewozotop.pdf
    • http://duwemanuwixam.atwebpages.com/matlab_for_engineers_5th_edition_solutions_manual.pdf
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_d5a28eec1bd54346a72a636299728e41.pdf?index=true
    • https://70f7ad02-001f-4306-ba1b-73cdfec2fc00.filesusr.com/ugd/23a6c3_7ef239f4df784c1cb72313812d949285.pdf?index=true
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_86e048deaca945dd8e260b2ca0663c17.pdf?index=true
    • http://zasuwunal.myartsonline.com/how_to_set_my_onn_alarm_clock.pdf
    • http://tuminexozuvino.atwebpages.com/dyson_motorhead_cordless_vacuum_cleaner.pdf
    • https://s3.amazonaws.com/mamibis/real_chess_3d_free.pdf
    • https://s3.amazonaws.com/vososasoxumete/samsung_nu7100_55_user_manual.pdf
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_b8120fbe1b7a4140973ad01ba5b9c406.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b5.bin
2f8c82631cc04bfceee9d2c40849ad8ef6af9c937336fa11e56a74ad926799a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 5452 bytes
font_01_sfnt_off00010407.bin
8ece95ab196135f91a21dc4fe4dfccf408a814d533f5c891d124d9e780ba7ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 12228 bytes

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