Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55d81d63e4b9dfa…

MALICIOUS

PDF

81.7 KB Created: 2021-04-17 18:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ee790bc3fff97dc6f522340e69a18184 SHA-1: cce6e8f295fb932340ee6aa83dc6c4fe8d82ffd7 SHA-256: f55d81d63e4b9dfa42caf8ff58cdef36da72d08659bda8e4a4837fd1bd57d61e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or hosting malicious content. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=why+is+my+fridge+leaking+water+inside PDF link annotation
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/7909779.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/kIegjJa/lukuviguloligus.pdfIn PDF document text
    • http://tebapewulodafe.getenjoyment.net/sefujus.pdfIn PDF document text
    • http://mibejar.sportsontheweb.net/zetudorojav.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/boviz.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/egg37he/chevrolet_spark_2017_manual.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/fe48aeb.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/college_algebra_and_trigonometry_5th_edition_solution_manual.pdfIn PDF document text
    • https://nifudosuv.weebly.com/uploads/1/3/4/0/134040563/dd9712.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/yjiXih4/kemebo.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/fghqmPC/93499290592.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/c640a6a2-c171-4331-a329-ce8b4eb530b7/futunodegodaxaxedaxodukav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3875e76b-1425-47e2-9520-f2779cbfb2ce/all_the_codes_in_army_control_simulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c95848f-0447-497f-85ec-e7659f075658/besasazamudonegoguxuxoxab.pdfIn PDF document text
    • http://reniwen.rf.gd/33470001621.pdfIn PDF document text
    • http://luxupuxud.myartsonline.com/jabudogonevajejirodel.pdfIn PDF document text
    • http://pesewaluzitapu.epizy.com/vosunejebidibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8c13b2-d58d-4efb-98dc-48d624e8b5b2/19571441841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7b5c13-7b19-4474-ae25-4a04736a5b87/41385096712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f35d21-cf75-46a1-b4b9-ea4e38dbd80a/lapuvux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee19cec1-f0c3-4fda-867d-27f99ed42b86/maxiwiposojevinerufixuzi.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_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 5592 bytes
SHA-256: 572a09f7d66675a75d741cc97569617dfcfc7c18e153220fa2205e43733bbc33
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 10812 bytes
SHA-256: 6b29f412815bebadc721027b12e25c8e73dfc82131d1a21c9c4cba18b4f5f044