Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f131435a8609be6…

MALICIOUS

PDF

67.3 KB Created: 2021-03-01 07:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 135b541d3f36fcfc349f0057b591d9c3 SHA-1: c11ae6083a8e3bc335ced83859cd176e82be0c79 SHA-256: 8f131435a8609be6bad335d538e08a0fe914251744163d6db3d567b1a9f751a3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

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://druttle.ru/123?utm_term=calories+sonic+pretzel+twist PDF link annotation
    • https://cdn.sqhk.co/gabisolovima/qihgJhh/mods_for_minecraft_pe_android.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/sierpinskis_triangle_formula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_60136168ac4ad.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/42282088539.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/7sZMgeI/gupawewibuxulimulev.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/jiShijb/tenekovojuzofizibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_600d5161848eb.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/zifozujiwi/marketing_plan_2018.pdfIn PDF document text
    • http://wevumixedin.rf.gd/fekuwafisos.pdfIn PDF document text
    • http://futikuzita.onlinewebshop.net/what_is_the_primary_purpose_of_managerial_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/99621900790.pdfIn PDF document text
    • http://boragilaz.rf.gd/mirutuzesulurebopetofemuz.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/theres_a_map_on_my_lap.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/juxoridagaboj.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_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 4972 bytes
SHA-256: 4d5a415b4c1b12286035132ae8e6bc6bc4848880b5847f170d114b2acc32583f
font_01_sfnt_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 10496 bytes
SHA-256: e0042a187ceaf5d7baac6fda99ed9d6e3f04268ae68876f7791388e58668467f

Open this report in the interactive analyzer, or submit your own file for analysis.