Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bb1360cd01be7a…

MALICIOUS

PDF

74.1 KB Created: 2021-04-09 00:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b5ec8e2c785fd568378edbbb3f95583d SHA-1: 32e0c74fa4e0b4ac5d1e886bb555e67c93a837b9 SHA-256: b4bb1360cd01be7aa2a6e7eb91302ad91bc6ef7564783067aede0204c916cb4b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to attract traffic. The primary malicious URL identified is 'https://mezovuduw.ru/strik?utm_term=atlas+copco+compressor+parts+south+africa', which is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=atlas+copco+compressor+parts+south+africa PDF link annotation
    • http://compte-cmbretagne.best/taco_bell_shredded_chicken_burrito_calories597ml.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5fdf34017dc94.pdfIn PDF document text
    • http://digitaloffice24.ru/aquifero_guarani_processo_de_formao8mp56.pdfIn PDF document text
    • http://raisinshub.club/gifadexemofikonahwmsr.pdfIn PDF document text
    • http://naturaleone.space/vukenaloxonr7m35.pdfIn PDF document text
    • http://letgtma.bid/quantico_va_weather_reportzcyqi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_6068053095db3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_dc1baedab7a14c24891aeb98111ec787.pdf?index=trueIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_c5871cc270c540c79e2cadbf69b2ee76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc241346-a869-402f-9884-5ca77aef7aa0/lugos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e2fbff-e5d7-47e0-b705-8c41b1281734/how_do_you_fill_up_a_brita_water_bottle.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_23ebd29d443a49f8a2fca3e78a3dded9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/beda98b5-8eff-4949-8e73-84c2dd530bad/74843354436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54570d21-292a-4bb2-aef5-2f83988e720f/what_channel_is_classic_country_music_on_directv.pdfIn PDF document text
    • https://f19d2187-ce67-4d04-8798-eef694565169.filesusr.com/ugd/bd4746_7f6b56e16a804698a1758d56c0b2d61f.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_620b74e6c750406baade88fdd1abda76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de074f9-7528-4471-9525-f5f99d2a9c72/54165594226.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_ac13372014e24bf3992d4fab20acdf81.pdf?index=trueIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_934038452fcc4ce2a180f73648663948.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a472072b-0bbf-4035-99dd-ad6774588b30/56736085311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f413f7-bf66-4d45-ae4a-f131e80c4a10/what_personality_type_am_i_compatible_with.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_fadfde5dffdc4d93a6d742da98f0e6d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3019baea-6ab4-4584-b58d-916d8bf3c5ca/kamufonemon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0da74d-7aae-4ebd-9e39-f131b863def6/signs_of_life_in_the_usa_9th_edition_citation.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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 5244 bytes
SHA-256: 2d8a4c9cf24f02ec7d35babba9da799368f620109b245762c9bcffa777e56781
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 11644 bytes
SHA-256: 4e49a3a1e48000f8682f57b371f2a517a17941e27a3c1df1b35451564e67082b