Malicious PDF — malware analysis report

Static analysis result for SHA-256 d399c428fff82031…

MALICIOUS

PDF

82.9 KB Created: 2021-03-26 04:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66cd58ff42174f61dc0cf7e71ebea6b1 SHA-1: d741ca389d4c58519141a857c6a79e931975ffd2 SHA-256: d399c428fff820310ad88524fd8f46b090c52472719f6913a214ec18d1f3ead2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=actron+cp9575+codes
    • https://cdn.sqhk.co/ravusigi/tgqiejg/descargar_moto_loko_2.pdf
    • https://cdn.sqhk.co/jutigurotow/Rgh7VJY/81998400945.pdf
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/3040702.pdf
    • http://podifodosej.scienceontheweb.net/34105815190.pdf
    • http://sutivetowit.mypressonline.com/gukosubulak.pdf
    • https://cdn.sqhk.co/lexebogefaj/fGihGPp/76275081022.pdf
    • http://zowogusatutojus.mywebcommunity.org/cema_conveyor.pdf
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/detubevawaf_terejogunimu_mozulezila_rifob.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejokazemur/tv_guide_melbourne_abc.pdf
    • https://s3.amazonaws.com/sazixipame/o_d_f_ka_full_form.pdf
    • http://sofibimibojas.myartsonline.com/nakezufog.pdf
    • https://uploads.strikinglycdn.com/files/ed19155e-f24a-466e-be3a-6732bb5b9701/13243046576.pdf
    • https://s3.amazonaws.com/gewuwasi/recruitment_process_map_template.pdf
    • http://sipanokule.onlinewebshop.net/3_basic_physics_equations.pdf
    • https://uploads.strikinglycdn.com/files/34b5e3dc-75c6-42bd-8f64-25d1ca451c32/79443105029.pdf
    • https://s3.amazonaws.com/gupawupigawono/95813307128.pdf
    • https://s3.amazonaws.com/xotomisen/newest_version_of_instagram.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_off0000f231.bin
59eef47810d3fb927f6d17b3ac944cd72ea21afbcea40f96c366194c0a7d452b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 3764 bytes
font_01_sfnt_off0001013a.bin
efdd211eb85f77dd7951d365e4dc16ea04630b93182385b5d8a65c67414322fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 5176 bytes
font_02_sfnt_off000112f9.bin
f855cf2181359fe9d1352eb3c1915705cf4186714a91d8d05da12e3919532394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 12972 bytes

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