Malicious PDF — malware analysis report

Static analysis result for SHA-256 33991cb792a228a8…

MALICIOUS

PDF

72.0 KB Created: 2021-06-12 23:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9236cacdc0f21296ac7dc15fe6698321 SHA-1: 33b5afb016310f2e914ee5b6d51d42992d1e11a2 SHA-256: 33991cb792a228a8f48410f469084b2aa03f83a998e311142b8e8a2f9abe9982
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of the external URI is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/pbw?utm_term=cutting+circle+on+table+saw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418584/normal_6028b8155e98e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6023ec5c6c9f0.pdfIn PDF document text
    • https://zalozudipob.weebly.com/uploads/1/3/4/6/134673455/rosevawewu.pdfIn PDF document text
    • https://furivupes.weebly.com/uploads/1/3/5/2/135295821/280664.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/fe187c6f1a.pdfIn PDF document text
    • https://xovokemuzulu.weebly.com/uploads/1/3/4/7/134703915/41062.pdfIn PDF document text
    • https://sudewivevumofe.weebly.com/uploads/1/3/4/0/134042571/3780692.pdfIn PDF document text
    • https://kitijudaxedefex.weebly.com/uploads/1/3/5/3/135350735/3922589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_60b97dbbced49.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/947899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_60badc134be69.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/146d6e18-9109-45c3-8923-a7a19048efc1/84772198896.pdfIn PDF document text
    • http://tewabavuxate.pbworks.com/w/file/fetch/145161468/43313394808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b440a5be-d005-4211-a34e-e30031aee53d/dixuxafeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d011525-2021-43ae-b674-7761d816313a/repabovakokudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a9d122-f696-41e7-b76d-8df0309e0d06/70534792341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8076d407-65a2-4f02-b4ab-db4b67d9c7ed/troy_bilt_pressure_washer_carburetor_linkage_diagram.pdfIn PDF document text
    • http://pikalunik.pbworks.com/f/are_ikea_kitchen_doors_standard_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a801be9-3e5c-412a-b8f8-e700348cf699/20330578256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e826daa8-e6b9-4792-849e-e6377de27244/7.3_powerstroke_oil_pan_dipstick_leak_repair_kit.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427224/what_is_academy_sports_return_policy.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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 5104 bytes
SHA-256: 4c9e229b2733d64d3c5f8fed49fb53096962a21e64d805971502b2e00d2b94ec
font_01_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10028 bytes
SHA-256: 58f407274ef848df77f0f92a4ff500c185c35385262611df0fdabd00307bd820

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