Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cad307a66838fe…

MALICIOUS

PDF

74.1 KB Created: 2021-01-14 11:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 357df01692a6be7a96132aec51b720ff SHA-1: 7ac2a2e890e473374ad5eafba62b646e2c566434 SHA-256: f4cad307a66838fe855838f0abd6933f778c9db86ea0c59f32e8dadc6e5d7e9d
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('traffset.ru') and another identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests the document is designed to redirect users to external, potentially malicious, websites.

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://traffset.ru/123?utm_term=mitchell+labor+time+guide+free PDF link annotation
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/3722862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd1e4fd51c6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5fa9b25ad138e.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/rufar-majof-sisefoxepa-matemulifipak.pdfIn PDF document text
    • https://fubasuwa.weebly.com/uploads/1/3/4/6/134611144/5d8a4318089192.pdfIn PDF document text
    • https://figenudar.weebly.com/uploads/1/3/4/7/134754197/1490058.pdfIn PDF document text
    • https://site-1172550.mozfiles.com/files/1172550/wolofaxaxudujokilolapaje.pdfIn PDF document text
    • https://site-1176205.mozfiles.com/files/1176205/battle_simulator_counter_terrorist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f94dd1c4def6.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://s3.amazonaws.com/daniwodug/personal_blog_template_free_html.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/kemajuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/best_android_rom_for_galaxy_s5.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 5180 bytes
SHA-256: b4b5a3bcc30cc28c082f0793b16444833216f11849b517cf9f9eeb429e811927
font_01_sfnt_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 10868 bytes
SHA-256: a59614c63435c0becf74447ca125deacf3cb55a9e3fb2418088a800e34e4edd6
font_02_sfnt_off00010dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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