Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f85379212c28f6…

MALICIOUS

PDF

78.1 KB Created: 2021-05-10 05:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1d16a0d1dfe8554b028514c0751eb5a2 SHA-1: bd2e32213471a64e2a3ef7db90c5cc13d5f6abb2 SHA-256: 20f85379212c28f6f2c01801e015cd0b9ceb5fa88f9f0d9845ecc1e3be3816c1
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, which is a common tactic for phishing and malware distribution. The presence of `utm_term` parameters suggests a tracking or redirection mechanism, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=who+plays+the+cop+in+cloudy+with+achance+of+meatballs+2 PDF link annotation
    • http://youtube-subscribes.com/73678130770dqz0y.pdfIn PDF document text
    • http://creditpm.com/jawabkom_the_detailed_answer_dailypqsk8.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/gjOgriN/57576313521.pdfIn PDF document text
    • http://richteam.site/after_effects_trial_windows1j9nc.pdfIn PDF document text
    • http://idealica-ordina.site/data_warehouse_design_examplesl5mxp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_60474fc435b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/CwCibNJ/41414200666.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/28562550674jtc17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5ff338452ee12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fdbecedf34ca.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/dc4a36bd-7b97-4488-bb8d-88b6697b9077/how_to_apply_hair_color_to_gray_roots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0b7eec-039b-489c-abde-9559bcf29a73/ejercicios_de_conversion_de_unidades_de_pulgadas_a_centimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707947c6-b4b1-482a-b669-5bfa7d3babbc/83664095582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284ed9bf-4359-4896-92f0-17a05de5125a/zezas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4841348-90d5-4d04-9244-91684775e6ba/hp_laserjet_p3015_printer_cartridge_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7c9cc7-dd63-4d70-9e83-6f710418fa25/jijogajilemir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c0aab0-bc04-49cd-acd3-e527c76620d7/nuvugojitonitedijatut.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_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 5776 bytes
SHA-256: bf19a97602f5ef1f498a99fdc6dc5ccba87537bab1f32e563fc99a9ac1adc368
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 10892 bytes
SHA-256: 7b7c7aca450bca22c5a350b1bdcdb0d24d1957a7d967fcbd3b3d1f5d90c63c8e

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