Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9086cf2f165592b…

MALICIOUS

PDF

73.0 KB Created: 2021-06-09 03:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 40d0e477ec9468370a80a9840a6680b8 SHA-1: 53ff75d646daa8ae688f3f610a29c41e2da435e3 SHA-256: b9086cf2f165592b79dc70a4a3a2dc314afed50f91b00d9ca3518ebdcaf8e27e
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a prominent one pointing to 'nomylo.ru' and a query parameter suggesting a free game key. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing/trojan. The ML classifier also flagged it as malicious. The primary attack pattern is likely phishing or malware distribution via a deceptive link.

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://nomylo.ru/pbw?utm_term=sea+of+thieves+key+free PDF link annotation
    • https://sulovuve.weebly.com/uploads/1/3/5/9/135973568/gikufutexejejagijed.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/d620461ca06f1.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/b33227be36f60dd.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/8955775.pdfIn PDF document text
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/xusiwux-jemuliveras-jewus.pdfIn PDF document text
    • https://nosadipopone.weebly.com/uploads/1/3/4/4/134470180/fiwulamexuxo_zenowewa.pdfIn PDF document text
    • https://mazaziwijofe.weebly.com/uploads/1/3/4/7/134757439/2540081.pdfIn PDF document text
    • https://karinavoru.weebly.com/uploads/1/3/4/0/134017817/ee454.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/8efe32b4a443.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/1f61c464-4a9f-405a-8a32-655d5a0ab188/54221848923.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144471408/varget_reloading_data_224_valkyrie.pdfIn PDF document text
    • http://zobafolu.pbworks.com/f/how_to_connect_hp_printer_to_acer_chromebook.pdfIn PDF document text
    • http://vixifalino.pbworks.com/w/file/fetch/144576291/cpm_integrated_math_3_textbook_answers.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144418521/consider_the_lilies_of_the_field_piano_solo_sheet_music.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/f/ozonolysis_of_alkynes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df96cfa-50b8-49ef-9b31-62572ec2215f/adj_dmx_operator_pro.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/44615520307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d9243c-3787-4232-b8e8-17aa18279213/what_is_group_theory_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48271b2e-1730-46d8-a0cc-647ed192392f/pinuxiwazanuzapusi.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_off0000e001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE001 5152 bytes
SHA-256: 011773872e07fabda15f889c513c7f239f5637117648b9de07fe6078aa068ad1
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 11196 bytes
SHA-256: d3951bf802930d92722f6a1425a814c5b2e80eb19fdb3133111403d22c3f98e5

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