Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c8be0867086e92…

MALICIOUS

PDF

131.1 KB Created: 2021-04-05 04:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8bdfd2c8f6366b86ec17ff2039af2db0 SHA-1: 22cc38c746d6155f75e341b412787b958603ca2b SHA-256: a3c8be0867086e92f2612c44f0c1c8a7d2919242852a826a1af4ec6487e3d563
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=chatal+band+music+mp3+naa+songs PDF link annotation
    • http://zevewidojodot.mywebcommunity.org/kolovezanakedefekuda.pdfIn PDF document text
    • https://powedumino.weebly.com/uploads/1/3/4/3/134350182/vefimuz_fusud_xiraxugur_gulokamibuk.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/lowrance_hds_7_gen_2_accessories.pdfIn PDF document text
    • http://wssummer.space/9970834749n6a68.pdfIn PDF document text
    • http://finansi-7.online/647066695696n9a4.pdfIn PDF document text
    • http://kleomaften.online/inventing_merit_badge_answersrxk9f.pdfIn PDF document text
    • http://qunit.space/dd_5e_archfey_patrons0ka3u.pdfIn PDF document text
    • http://warokibujiz.getenjoyment.net/adelaide_train_timetable.pdfIn PDF document text
    • https://togawakavepanef.weebly.com/uploads/1/3/1/1/131163752/26bd746bc65d53.pdfIn PDF document text
    • http://dfds.in/how_much_is_a_2014_jeep_grand_cherokee_overlandyb6rf.pdfIn PDF document text
    • http://sukotovomiregat.22web.org/gate_2020_chemistry_syllabus.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/1576514.pdfIn PDF document text
    • http://test123test.xyz/dell_optiplex_9020_mt_motherboard07mvu.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/9f401b433847e5b.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/cad7d4a2-7107-4172-ad0c-ceeafbd5e15e/kotukomurarepaxivejaluwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eeb2336-7de7-40e8-8cce-10a8da53cb32/how_long_is_a_maserati_quattroporte.pdfIn PDF document text
    • http://fokezazonof.epizy.com/gulugefopuwudu.pdfIn PDF document text
    • http://pejulok.epizy.com/tenoxetadowiwawewojuvud.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/bhairavar_slokam_in_tamil.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/komawizolote.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6A 7260 bytes
SHA-256: 1dfd39282ca50695173ae90d0c0353a5e17e978345245037c525678cb04c34c6
font_01_sfnt_off00018531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18531 5600 bytes
SHA-256: c97817014718a047dfae4dcfe12fcf874593b72b869ef86c66579427ea41703b
font_02_sfnt_off0001980b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1980B 23768 bytes
SHA-256: a1312a2f6128ea95765bc0dee273aad66b40ac8bd185fbd894de29b18ed1d93f
font_03_sfnt_off0001dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBFE 19384 bytes
SHA-256: b9c9736d20b7f622e19cf698ea7f382a4a65943bf06fa7a36b259b70687fd142

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