Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f4d3f931f2c0e7…

MALICIOUS

PDF

75.6 KB Created: 2021-03-29 03:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4bc59eab05c47835a0aca40048d85b7c SHA-1: c2fe4ba388626db4fef583e990e086497dce6a00 SHA-256: 69f4d3f931f2c0e74461e06a287fa12d4fd9f09e04281f563bf958ead516891d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/123?utm_term=cerere+inmatriculare+auto+dolj+pdf PDF link annotation
    • https://cdn.sqhk.co/zebasama/WibGHih/42515092997.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/Ahdidif/41882058740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_60302d6dbbca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_6027bbcd9eb36.pdfIn PDF document text
    • https://cdn.sqhk.co/tutadazi/aWgcjcM/zavuduxofidodajozejusun.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/1446298.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/kaxidezome_ximukuf_rurabesudojobos_jemenesafonuven.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/ohbhiRH/zuxabake.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/gegiBid/online_result_system_project_report.pdfIn PDF document text
    • https://cdn.sqhk.co/biwopeka/i9Cgejh/best_buy_open_box_laptops_near_me.pdfIn PDF document text
    • https://gofikebome.weebly.com/uploads/1/3/4/8/134847018/3540944.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/185928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6018d0e4a4a53.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/iighvhh/70405460626.pdfIn PDF document text
    • https://cdn.sqhk.co/zoravuzulop/AicmnNN/12886869530.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/jdAjh0Z/knight_of_cups_work_advice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_600fac302a54e.pdfIn PDF document text
    • https://xosinalujejiwa.weebly.com/uploads/1/3/1/4/131405948/xuxogepi.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/1bdafaf5-6039-4af4-9846-20724558d247/51286835973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c689da3-9e15-4fa1-b0f4-4ec5ea7e97ee/how_to_hook_up_steering_wheel_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9e46f5-2de6-485c-9f6a-33134c514d5f/what_is_the_best_edge_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de699395-cdfe-4062-a41c-0ea6e901262f/adafruit_arduino_board_manager_url.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328c9321-e4ce-40fb-8f50-26d3af98c26b/attachment_style_questionnaire_bartholomew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b6baed-4b5b-4155-9897-70fe9e148176/dir_655_reset.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_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 5104 bytes
SHA-256: c383eb71eb13ef6c8eda8bf0e7a7939aa9b002fefe29c8139809557c3e3fe223
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 12144 bytes
SHA-256: 6f214138ee0c12a57b55fac26ff440b9af349b3461ee70bf4dab69dff072b1c4