Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7e24e626e40d54…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 02:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6d440163527d693530e970529d41cf2a SHA-1: 9a11d88a6a228b03bc2215d6ec17077c00efcd70 SHA-256: af7e24e626e40d54691e47ab441bc00922f15463bd02cadda956fe196b4ed394
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, designed to redirect users to potentially harmful content. The presence of external URIs and the link farm behavior strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=attack+on+titan+tribute+game+offline+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5ff426a120cdd.pdfIn PDF document text
    • http://yourcy.com/exhibition_stall_design_portfolioluzht.pdfIn PDF document text
    • http://shoop-fk.ru/daneripijedafunudekojabibpte2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5fcf77505c197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_5fd988f153c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd610cbc62c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6014068cc0f57.pdfIn PDF document text
    • https://cdn.sqhk.co/fisejadiruw/jexjgii/35680682850.pdfIn PDF document text
    • https://xutareziwax.weebly.com/uploads/1/3/5/3/135327408/b70745.pdfIn PDF document text
    • http://train-home.ru/cdac_exam_questions_and_answersbpg77.pdfIn PDF document text
    • https://lupunudarowujak.weebly.com/uploads/1/3/4/5/134599946/ced05c.pdfIn PDF document text
    • http://remontvorot24.com/android_bluetooth_auto_connect_source_coderxgvh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamufigavoxi.rf.gd/how_to_solve_hardware_problem_in_computer.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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 5448 bytes
SHA-256: 2b774a6dc8eb38e6fa3defb8f3bb07c35f076e378d9ebf49b8564009d1abc977
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10596 bytes
SHA-256: 51137354e15c435044dbdcf6747bcbc93b4d4d43eb300899e56f5530528431e7

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