Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c54e4d358466652…

MALICIOUS

PDF

77.6 KB Created: 2021-02-20 16:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a978746eb66c41f83eb5434e8bb3204f SHA-1: d3f70a15537ce9b44b7c8b62e6b48a9ec08b9783 SHA-256: 7c54e4d358466652aea17dd2365245f4ce7f717c11c37bca6c5f11de784dcc45
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, likely to a phishing site or for malware distribution. The presence of external URIs and the overall structure suggest an attempt to trick users into visiting malicious content.

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://seumenha.ru/123?utm_term=what+is+conversational+ai+platform PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474170/normal_6023f7aab9164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fe4609423cc0.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/5656620.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/kavomijosub-monef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_6022e32e758e8.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hdLxq4Z/gukunikepoxej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6010db14796d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392218/normal_5fc8c25bb2ccf.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/8910906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pevivudawof.epizy.com/bhootnath_return_movie_720p.pdfIn PDF document text
    • http://tunogamux.rf.gd/bioshock_2_review_game_informer.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/58414403929.pdfIn PDF document text
    • http://dawivek.rf.gd/microsoft_autoroute_2013_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/53899322777.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/sound_intensity_and_decibel_system_worksheet_answers.pdfIn PDF document text
    • http://wijetifosoxi.epizy.com/motu_patlu_cartoon_game.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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5328 bytes
SHA-256: b8602c1532bd459d4365c88d22b864f5244081570c187368d63542e0050e6d27
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 10384 bytes
SHA-256: aa5cd09480b2572930d57601747f1fb42e04e0a8199c9e945667e47384cf3ec7

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