Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3b9e168e149e49…

MALICIOUS

PDF

79.2 KB Created: 2021-03-22 11:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 09ad73fe009900516e2813450cc6fe2a SHA-1: d5ec37edf569cd56481c563e28379e6452d31589 SHA-256: ce3b9e168e149e49f49888928ad5ec2daaa8fbcd6d62b9cce24aed770fe45fdb
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and search terms, reinforcing the lure of a search result or informational document.

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://vilenefex.ru/123?utm_term=charcoal+briquettes+ingredients+pdf PDF link annotation
    • http://xupokaxe.medianewsonline.com/holy_bible_red_letter_edition.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/is_there_a_reset_button_on_canon_printers.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/83973524323.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/ghh5ihD/cosmis_racing_s1_18x10._5.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/LRT7hie/17042419303.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/lodovudagivizoruf.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
    • https://uploads.strikinglycdn.com/files/582a90fd-b806-4edd-80d9-947a590aba8b/ruvojigulijaweledab.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/android_9_galaxy_s5_mini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8773f938-4ed5-4d9e-8fce-64183503cb2a/how_do_i_set_up_airprint_on_my_brother_printer.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/94686415720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94ff13c-0620-4350-826b-6a4291559f4a/95205423909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14b880f-16a6-4f1c-946a-876550982f8b/55292458062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff285c77-e9b6-45b1-a6df-1cb7d9dd3ede/dodowujofoxazuworitu.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/dewalt_compressor_d55146_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/what_is_the_theme_of_the_book_a_long_walk_to_water.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/grade_12_mathematical_literacy_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/40979585560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a22ee9c-0d30-4cb8-88e6-1b0bbeb5bdf1/what_are_your_teaching_goals_methods_and_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98552c59-1e15-4aae-ae33-5ed2d2a2e9bc/armitron_watch_price_in_bangladesh.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_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 5588 bytes
SHA-256: e7ded57d3603c3e2f1713e0f068bd710b640f62f440a70228420622be5021230
font_01_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 10604 bytes
SHA-256: 8e78127e96f4fc91b16bc6255b3cf4575f7d01d760f4b4910d7afdd822efeb43
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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