Malicious PDF — malware analysis report

Static analysis result for SHA-256 e308165a77539b62…

MALICIOUS

PDF

67.5 KB Created: 2021-03-12 15:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7a188f9e48edff493e9b66c3ecd7b23e SHA-1: 289bfdeacd614fb6fa316f7d4d0b16d6d9c9d51e SHA-256: e308165a77539b626e5c52f2561ebeccd92f3c1d8da4c6f990b474e2e933d51e
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host malicious content or redirect users. The PDF structure and embedded links suggest an attempt to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=photos+ananas+free PDF link annotation
    • http://varuzajuv.22web.org/renal_artery_aneurysm_guidelines.pdfIn PDF document text
    • http://vurovolapoza.mygamesonline.org/as_bill_sees_it_page_165.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/catalogo_ikea_2020_usa.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/arris_modem_login_dg860a.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/32215436161.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/munevogejonikotelu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_208f5ad14d5c4b1dbad103c3dd3a8c57.pdf?index=trueIn PDF document text
    • http://xobebol.onlinewebshop.net/how_to_be_a_cia_operative.pdfIn PDF document text
    • http://livasesokod.epizy.com/73712561332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44a77caa-f845-45fe-9b4b-69ee3cc8acf0/84282088353.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_7a3a4ba6ad7344eaa5c75bea75309dd0.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_60787b26ab994697828f967c7b2bf68b.pdf?index=trueIn PDF document text
    • http://betakudo.atwebpages.com/xenexujuzup.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_bf639e3f29ce483780cde58c5bc5cdab.pdf?index=trueIn PDF document text
    • http://bigapenegig.atwebpages.com/mobepolowoduwulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c94bd36-aadb-42cf-b032-2eda5557389d/gtn_750xi_trainer.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/53086968735.pdfIn PDF document text
    • http://jigaxobipufita.epizy.com/mebufinusuvudikevekef.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_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 4824 bytes
SHA-256: 6c151ddf629d136789c876242375fb96e4b160112ba75f4ee4758fc8ce71445c
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 11700 bytes
SHA-256: fbd2249378a8bcf2d267b47b2204be9d139c6026812f5827cd6c731de68fbb2b

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