Malicious PDF — malware analysis report

Static analysis result for SHA-256 902c544ae25ba783…

MALICIOUS

PDF

86.2 KB Created: 2021-02-18 11:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: adafb55ed19555427dd30bb053500bac SHA-1: 6d6e09093353ef63bd40f5311f2c5949040d329c SHA-256: 902c544ae25ba783093a09e5f66932779d69262a1b390d3bb65acbadc36725d1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, which are likely used to host or redirect to malicious payloads. The presence of external URIs and the link farm heuristic suggest a phishing or social engineering attack designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=avid%20c24%20setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485014/normal_5fe9d3e4ece60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6014d2aeae04c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_5fe66a2708fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/WAQTnhe/jungle_background_images_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fe6e91c5eb00.pdfIn PDF document text
    • http://teenagetutor.online/box_capture_app_for_android6d0wx.pdfIn PDF document text
    • http://zvezdasevera.online/therapeutic_herb_manual_ed_smithdh7dq.pdfIn PDF document text
    • http://qunit.space/questionnaire_download9ds55.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/jfvjghj/tumblr_themes_for_fanfiction_writers.pdfIn PDF document text
    • http://milansit.space/63656377594c514h.pdfIn PDF document text
    • http://harmony-market.ru/ecology_definition_human_geography70ffe.pdfIn PDF document text
    • http://unonatur.space/nivakekedazekoruxo7ra37.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/gmgfcjj/scent_of_a_woman_movie_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivuxo/80593459072.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_off000116bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 4996 bytes
SHA-256: 4002657e4c67b5bfde56cab11390b9cf237ecee6e6c4fa36fe47a8fdb52c4e53
font_01_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 10608 bytes
SHA-256: bda0f8e264353db310de365b21ce9fd21380344b5afce2448a17a24fccb6a13c

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