Malicious PDF — malware analysis report

Static analysis result for SHA-256 9098281e9c52e468…

MALICIOUS

PDF

69.8 KB Created: 2021-06-04 23:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c747fc476772f1cfa1a7a95ffec3821d SHA-1: 7e40cd930260bd7afaa03f3dcd21e0f844f7e27d SHA-256: 9098281e9c52e46870e4d493e4a592ff8005b02e041397fcc1c85bb848595c5d
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains multiple embedded URLs, including one pointing to 'dafemum.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/123?utm_term=abelardos+menu+pdf
    • https://revapukas.weebly.com/uploads/1/3/5/3/135323612/bewunusuf.pdf
    • https://cdn-cms.f-static.net/uploads/4418590/normal_602a473e17f54.pdf
    • https://cdn-cms.f-static.net/uploads/4416665/normal_604afcc04fdb5.pdf
    • https://static.s123-cdn-static.com/uploads/4465543/normal_5fee67d778599.pdf
    • https://legifufase.weebly.com/uploads/1/3/4/3/134349809/xewebu.pdf
    • https://beroloxubotuze.weebly.com/uploads/1/3/0/7/130775422/nebidedimuke.pdf
    • https://xakasevam.weebly.com/uploads/1/3/4/5/134509313/60182e93b56.pdf
    • https://static.s123-cdn-static.com/uploads/4485443/normal_5ffe0c7f9652e.pdf
    • https://cdn-cms.f-static.net/uploads/4494888/normal_604e7b62552bf.pdf
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5ffaa74cba09a.pdf
    • https://cdn-cms.f-static.net/uploads/4409421/normal_60603b8cc10a7.pdf
    • https://sekirunive.weebly.com/uploads/1/3/4/4/134404638/a974f.pdf
    • https://static.s123-cdn-static-d.com/uploads/4453730/normal_60b07e1398eb9.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/874693825c1c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/55de2894-44e2-41a5-9efd-9ce1a4c0eedb/79394518671.pdf
    • https://uploads.strikinglycdn.com/files/33894cf0-45a4-4878-9757-8693c879d5fa/resistance_band_exercises_for_chest_muscles.pdf
    • https://uploads.strikinglycdn.com/files/646f00b5-6169-4735-9180-d8c64643fda0/fepipalasuwugifo.pdf
    • https://uploads.strikinglycdn.com/files/752ee2b8-f4d0-471a-a882-d039dabb259c/warehouse_safety_training.pdf
    • http://lakebimutep.pbworks.com/f/moxadaxuzudupisu.pdf
    • http://tijigika.pbworks.com/f/obsessive-compulsive_inventory-child_version_oci-cv.pdf
    • http://tasonupopam.pbworks.com/f/section_1_reinforcement_forces_inside_earth_worksheet_answers.pdf
    • http://mukonisu.pbworks.com/w/file/fetch/144455520/75259639183.pdf
    • http://fudejob.pbworks.com/w/file/fetch/144517809/39291585952.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d19a.bin
8c42624cbc4b8e0a2c6bd971c5cfa4170e4ffce37e3449e426885dd97d9b3865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 5316 bytes
font_01_sfnt_off0000e391.bin
15a6d6f97e13782b1901119b323f8a984c8d0bf4ec813da42da6009a1f13db1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 10968 bytes

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