Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5df89e6c74ca77…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 09:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6941877f30c9ed0222f1d6930684cf08 SHA-1: dc77407a7cdd5972e0fccc9b39de160513b1429f SHA-256: aa5df89e6c74ca77778ed479bfc39a53dcfd4ad215dbac85f7cbb45285a0fc81
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a spearphishing attachment designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=tecumseh+13+hp+engine+surging
    • http://yandex-delivery.cc/rojakawofuwxw81.pdf
    • http://whysmall.space/971508835235bpcz.pdf
    • http://twitter-center.com/how_to_graph_linear_equations_using_a_table_of_valuesofvs9.pdf
    • http://sportplays.ru/dizarodezefirikikaslnhxq.pdf
    • http://deutschebank-meine.com/logo_modernism_jens_mller6jgow.pdf
    • http://funasowuto.getenjoyment.net/amphorae_and_the_roman_economy_an_introductory_guide.pdf
    • http://rowexusaje.mypressonline.com/algebra_eoc_practice_test_1.pdf
    • http://auto-agents.space/jeevan_lakshya_planws7on.pdf
    • http://lunesygets.xyz/71391852691bkrj5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/89f56919-b181-45cd-a345-657af4800351/when_a_guy_says_he_really_likes_you_but_doesnt_want_a_relationship.pdf
    • https://uploads.strikinglycdn.com/files/7b39310d-6f90-4a28-bf4b-b76fdfc3581d/fl_studio_mobile_3_free_sample_packs.pdf
    • http://nisetekotixob.myartsonline.com/97892980131.pdf
    • https://s3.amazonaws.com/tigovatolis/bapovugepotegifokaduwej.pdf
    • https://uploads.strikinglycdn.com/files/d85f033f-e109-4448-bbd7-1b342a90bfdd/fun_creative_writing_activities_for_adults.pdf
    • http://jawuwibunoropo.atwebpages.com/bsc_nursing_1st_year_biochemistry_book.pdf
    • https://uploads.strikinglycdn.com/files/ccd20f52-2f12-4572-99a3-6b4ffa513a95/what_is_the_cost_of_a_swim_spa.pdf
    • https://uploads.strikinglycdn.com/files/9842eac0-5771-42fd-9d78-8bb900111a3e/2007_mazda_cx_7_starting_problems.pdf
    • https://s3.amazonaws.com/bezorito/que_son_los_verbos_irregulares_en_ingles_y_ejemplos.pdf
    • https://s3.amazonaws.com/dobesogum/tajujodobedenebojum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73c.bin
2c0d510e10508ba0536292382f211cdcc171ebc84b0a9b3be84dbdfa83398659
pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 5268 bytes
font_01_sfnt_off0000f90d.bin
cddc9033789068bed0888c6c23c13200221a00adb84a8407a5b776fef2748093
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 10972 bytes