Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf03b24bc9964fe8…

MALICIOUS

PDF

131.3 KB Created: 2021-01-06 09:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 763767af41e537b539086f7ad46f6079 SHA-1: 7c9f5f50d74dbc377f7f1f1c06321319980bb868 SHA-256: cf03b24bc9964fe84d539ce001eee986c64003a901b148672427e3c0ad7dd01b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high concentration of them pointing to disposable domains and link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely designed to redirect users to malicious content.

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://trafftec.ru/aws?utm_term=fiber+cement+sheet+production+methods
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/788710f303b61e1.pdf
    • https://cdn-cms.f-static.net/uploads/4481422/normal_5fe7f5c8ad419.pdf
    • https://pisefipekopaz.weebly.com/uploads/1/3/4/4/134461515/7286261.pdf
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/747984.pdf
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/jowebutejed.pdf
    • https://static.s123-cdn-static.com/uploads/4410678/normal_5fce229c5b2a6.pdf
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f8864bf7593b.pdf
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/wejufililos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e26ae102-5f8f-44c8-ac80-b86cf5f18a8e/gipumo.pdf
    • https://uploads.strikinglycdn.com/files/36587dd8-6801-43e0-835a-ac307cbd064c/mario_flash_unblocked_3.pdf
    • https://uploads.strikinglycdn.com/files/0b240757-878d-42af-b09f-6e7a81c472fb/jomalozo.pdf
    • https://uploads.strikinglycdn.com/files/32ed3378-60be-42eb-8f31-ea9484429d91/34157322955.pdf
    • https://uploads.strikinglycdn.com/files/08fdddea-f0c4-42ce-b548-7e0414da7513/schema_electrique_interrupteur_horaire_legrand.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b088.bin
bdced08980488f8be5f77fd77fce5d04c3ec102e5ceefcfe6741e6bc1c1ddc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B088 5048 bytes
font_01_sfnt_off0001c177.bin
e7b952ea17a0d8cc40b90f623cdff2f1f56bce0a636bcb11dff47a617c57c409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C177 15712 bytes
font_02_sfnt_off0001f25f.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F25F 4324 bytes

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