Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85dc61a1536ef15…

MALICIOUS

PDF

90.5 KB Created: 2021-02-26 17:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: f4b6a1388e29ed4c8b8c7509fd581203 SHA-1: 04050af297e6ac73ed237efab3b66b21eee3535b SHA-256: f85dc61a1536ef15cc0903ebc3c84e96bb00ee2d7849dd4a8df5a5dc16da9bad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, suggesting an attempt to obscure the final destination or distribute various lures. The presence of external URIs and the link farm behavior indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=division+2+the+g+phillips+protocol+reddit PDF link annotation
    • http://madoxorijegobe.sportsontheweb.net/infinitely_repeated_games_exercises.pdfIn PDF document text
    • https://xutorobufazam.weebly.com/uploads/1/3/5/3/135345650/997236ea2e3b.pdfIn PDF document text
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/wamoniguk_naturexitesida_wadorerekadeveb.pdfIn PDF document text
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/gadavitati.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/how_do_i_use_my_nespresso_aeroccino_3_milk_frother.pdfIn PDF document text
    • https://fixexetakofipu.weebly.com/uploads/1/3/3/9/133997797/muwaneliwidar_likejuza_fifevoj_renof.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/what_is_coding_in_software_engineering.pdfIn PDF document text
    • http://olx-delivery.cc/rakuvonimuwaxirodidezl96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wasalesex.epizy.com/exploring_science_hsw_edition_year_9_answers.pdfIn PDF document text
    • http://xedovafimolodem.epizy.com/logo_game_answers_level_4.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_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 5316 bytes
SHA-256: 9fa37f2154b46824345e3395a69190696f74f0fbecafb202e63f45a47132f767
font_01_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 10632 bytes
SHA-256: 122a2f79665cd212ef2712f1f05ff7790136505b11662d29fbb9ce8f51206175

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