Malicious PDF — malware analysis report

Static analysis result for SHA-256 8573b1487c7e3f6f…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 06:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d872abf2c51d53ce281417d2e133e987 SHA-1: 140fcfce346754bc74670e2bce00fce9c534212f SHA-256: 8573b1487c7e3f6f394daf5a187dbfda083d8ffa49550e4f681a204c936fad90
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru' and a deceptive query parameter related to a trailer song. Heuristics indicate this PDF is a link farm on disposable hosting, designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=thirteen+reasons+why+season+3+trailer+song PDF link annotation
    • http://sipipewawezizuf.getenjoyment.net/how_often_does_a_judge_agree_with_a_guardian_ad_litem.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/ninelorigosetuwalax.pdfIn PDF document text
    • http://soferijivav.getenjoyment.net/51569571677.pdfIn PDF document text
    • http://mp4.design/96582091475akft4.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/bgjnieB/racing_moto_3d.pdfIn PDF document text
    • http://disclosures.space/slope_activity_worksheetvzwu2.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/theory_and_practice_of_counseling_and_psychotherapy_exam_questions.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/pubefimutug.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/ZhhPMii/spelling_activities_for_high_school.pdfIn PDF document text
    • http://garant-ritual.online/baklol_video_part_6zt0ee.pdfIn PDF document text
    • https://cdn.sqhk.co/budufunewuf/01jdOXQ/tisonadotewed.pdfIn PDF document text
    • http://lipatajewaxo.22web.org/86068721913.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/7802cc6b-347c-473e-a5ee-3c54fee4c7ef/30085146860.pdfIn PDF document text
    • http://xajokaxakubif.rf.gd/3918886874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61761424-87bb-4e46-9fa0-191c6b85ae50/97588881702.pdfIn PDF document text
    • http://katudajug.epizy.com/tibadomepesidazone.pdfIn PDF document text
    • http://zusizad.epizy.com/analtica_web.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/10381111333.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_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 5040 bytes
SHA-256: 287705fa1e94ad4f010ca269e7caaae389f0ea4aee5e3f6e06372fc092a8474b
font_01_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 11028 bytes
SHA-256: 6e436f24957d7dd2d570b5a5203cc10cf0b0b18a7eca2006e282d95c813e76df
font_02_sfnt_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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