Malicious PDF — malware analysis report

Static analysis result for SHA-256 f373660857933953…

MALICIOUS

PDF

90.2 KB Created: 2021-03-06 20:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a16a7cf3029ee15f0d1043457c56e0c5 SHA-1: 2a619f1a810927f6540362df81cef328a713143a SHA-256: f373660857933953ea0e0ddaf629bc0a18141cdc6d012bdbbffb5bffc6a5cf13
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

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://vilenefex.ru/strik?utm_term=champion+generator+repair+dealers PDF link annotation
    • http://vamidotaxipigop.iblogger.org/uc_mini_browser_apk_android_2._3.pdfIn PDF document text
    • http://xurivikarode.iblogger.org/nokobizibapozimepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5fd21f265fa22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_600e225e636a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_601f38a164104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468550/normal_601e1f914a00c.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/savizazitamexipaje.pdfIn PDF document text
    • http:///\\\/twitter.com\\\/GeneratorsDirec\,\icon\:\icon-twitter\,\title\:\Twitter\},\Pinterest\:{\href\:\http:///\\\/pinterest.com\\\/generatorsdirec\\\/\,\icon\:\icon-pinterest\,\title\:\Pinterest\},\YouTube\:{\href\:\https:\\\/\\\/www.youtube.com\\\/user\\\/ElectricGenerators\\\/\,\icon\:\icon-In 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/b26002d1-b13d-484f-82bd-4fb8d4453079/imprimanta_canon_mp160_manual_utilizare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbefb6e-cdbd-458a-9a3e-30f27e5a6b59/canon_mg2520_scanner_driver_download.pdfIn PDF document text
    • http://kurejob.epizy.com/nizuziwubizilefavika.pdfIn PDF document text
    • http://vomalowo.epizy.com/60002373151.pdfIn PDF document text
    • http://wuwudejirogipux.rf.gd/papigebopun.pdfIn PDF document text
    • http://losaxoxajav.epizy.com/kerala_psc_lab_technician_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4773a0c-3737-4f02-8f18-54afab29e17b/51091899841.pdfIn PDF document text
    • http://poxatita.epizy.com/how_much_does_a_new_peterbilt_379_cost.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/kajowibakozalod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0903781f-f9c1-4079-a0c9-4188a6746652/mabusetewidefaminot.pdfIn PDF document text
    • http://xaduvegovoz.rf.gd/crystallography_of_martensite_transformations_in_steels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff819fcd-ed4f-4b94-a46e-e2d7e272da81/what_is_the_xia_dynasty_best_known_for.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 5280 bytes
SHA-256: 569409010a9df7b95d556fa18d7be8d9fdcff606380c91478ff7a8340b9a6e72
font_01_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 12572 bytes
SHA-256: b6a1c9808df5ed2b47a19da6f2eeb088a3500faa63a47e519e75f0b3dd32decb
font_02_sfnt_off00014647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14647 16120 bytes
SHA-256: 653593fd1d80a85ed6f0165f1aba34eea3860f78c4af0c5284fe4824caf7b9a9