Malicious PDF — malware analysis report

Static analysis result for SHA-256 754cb3ce43f9f245…

MALICIOUS

PDF

182.0 KB Created: 2021-03-21 00:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7a1727f206498e2307b9500109f10eb3 SHA-1: 949d1cd9ebbff8b5d5a344e5829fbaee5f7fb99e SHA-256: 754cb3ce43f9f245b14dbe77bf64218a8d7946126608621ccdec57715a7820f7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded URIs pointing to external websites, including one hosted on disposable infrastructure, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search term, which could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=atmospheric+correction+in+remote+sensing+pdf PDF link annotation
    • http://kafalukuwemi.mygamesonline.org/rifididisajisol.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/43578151663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_6047dfaf4b43f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469365/normal_6048a75fa48d1.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/bae171b9-7924-4e91-8ec1-cd8eec8ee3e4/jukate.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/jafimazupijurej.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_9bde4936572b44c6910995aaeaaaf13f.pdf?index=trueIn PDF document text
    • https://1f155014-1e6f-4189-ab95-3679d9c2160a.filesusr.com/ugd/9b7d8a_cdcc4f38c2d7406883f1597472301c66.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_2da1bd67e243485fb8ac5c0d9204abec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbab414-403a-4aad-ba37-ce18d80984f5/57256821523.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/2011_honda_pilot_repair_manual.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/1200_calorie_low_carb_diet_plan_for_weight_loss.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/articulo_de_opinion_sobre_el_feminicidio.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_28fea2e5ff0449fab8f7e30f8767a88e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4eb7955-9d28-4831-b6c2-ae9a87e6d8c6/does_foot_size_indicate_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56649dbc-2e02-49ec-bdd7-911515005fda/zokimubuvixot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f50e64e-963a-4717-ad05-e22b1cedab8e/total_flow_rate_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/how_to_use_airplay_on_samsung.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_off00028be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BE4 5316 bytes
SHA-256: d80609dff3a11a6aecf21f89a5154ee916f2423b6daa153e098e9fedd09fd06f
font_01_sfnt_off00029dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DD8 13568 bytes
SHA-256: cbd59ab220265ce1923dc6b62743ebf4129e9357d5cb9cf82fe1196adee62ad4

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