Malicious PDF — malware analysis report

Static analysis result for SHA-256 55dee610ba0407c9…

MALICIOUS

PDF

74.3 KB Created: 2021-03-11 06:36:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7037b6cd1abcebe0a6aba01f43f85794 SHA-1: 90b7c682ebf9600d20777115cb03bde32d7a8540 SHA-256: 55dee610ba0407c915245d7afa04cbecd93ba5b7a72d0d4e8920f11bf912e83a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded URLs, with at least one pointing to a suspicious domain (fokemale.ru), suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of numerous external links indicates a primary function of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fokemale.ru/123?utm_term=sheets+for+uppababy+vista+bassinet+uk PDF link annotation
    • http://repair-monokoles.ru/hirepro_aptitude_questionsvns00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fc9f910606f7.pdfIn PDF document text
    • http://fruit-citrus.space/mutawazajebuksoqa.pdfIn PDF document text
    • http://peskomment.ru/how_to_change_battery_toyota_corolla_2005ilv5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_601d93b36f158.pdfIn PDF document text
    • http://goloszauniver.fun/kotamun7rk38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_60374a207b663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384310/normal_5ff1d7299eefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_601cffe94a182.pdfIn PDF document text
    • http://bristol-yalta.run/mobafwncx9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7eada3-ad9f-4005-aba5-6e75922a3502/how_does_the_bible_say_eve_was_created.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26bd1d7b-e085-47ee-b300-b7c1357575e5/rerugotov.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/98152756818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec5cc47-1495-4163-81a3-0ff842744d9b/perapagibeviwuwatomuxebad.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/xetal.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/bujosasefigirevuripeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae477eab-7d97-4112-8dc5-0f375a570b58/plotting_straight_line_graphs_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/weather_report_philippines_july_9_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/56716480650.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/student_exploration_nuclear_reactions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/71471742958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a715df55-674b-4f99-9fc7-436d52f7fcd3/buzz_lightyear_battery_powered_car.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc844d2-d084-47d2-ab6a-c3e11f237444/fisher_price_rainforest_swing_assembly_instructions.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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 5428 bytes
SHA-256: f2ab67e9cafdd5335db51bab7ecfdf1a2d3b71e561fad41715fce2db3c37f6c3
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 11284 bytes
SHA-256: bbaca01d33ff609d62ffc48955b8571509ba111e4ae5708ef308acb86a248adb