Malicious PDF — malware analysis report

Static analysis result for SHA-256 79767d34cd37a833…

MALICIOUS

PDF

84.5 KB Created: 2021-03-10 10:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 059ae981955403d01b489625c6ec28b2 SHA-1: 9e89b3505d8d876ab5124655a991525f56e507da SHA-256: 79767d34cd37a83364a177a325393b931f32857a3f09e01dd6923dd2cb7a1321
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to a domain associated with malicious activity ('vilenefex.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable domains to host documents, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/wb?keyword=weight%20lifting%20reps%20to%20max%20chart PDF link annotation
    • https://cdn.sqhk.co/vedanoderifu/djcytha/sonny_perdue_secretary_of_agriculture.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/LunVidE/65610789114.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuwizatag/Y1ij9gd/jojudip.pdfIn PDF document text
    • http://wersita.space/catecismo_da_igreja_catlica_completonpxwa.pdfIn PDF document text
    • http://agent-ritual495.online/letter_e_tracing_sheet8tvql.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/jahbgjc/legubidovid.pdfIn PDF document text
    • http://moneyindia.site/bokusii6f9t.pdfIn PDF document text
    • http://simkosa.website/how_to_read_codes_on_innova_3030jcoxf.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/vuxizewavojid.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/a_la_recherche_du_temps_perdu_proust_commentaire.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/associer_document.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wemazun/58798778121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7047addd-f37b-49c3-bdd1-d944077f7ad5/breakfast_at_tiffanys_online_english.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/sikujegetep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05664c0b-b6d9-4c01-aa58-5d7f5c8a4129/bufitomun.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/20006646513.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/politeness_in_pragmatics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa68e6b-5d71-4137-9cc1-b629237e88b5/89161882837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6549d6-c44f-41dd-b97a-865c7e10940a/how_much_does_a_special_needs_teacher_make_an_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e260cb2-c3df-4aea-a658-ebb03f5077c3/osha_approved_safety_glasses_with_bifocals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480afae0-7cfe-4d09-87df-7ef162d9e810/harbor_freight_6_gallon_air_compressor_review.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/15808750684.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 5508 bytes
SHA-256: 0779c6944c19f0b6136f16191d49a5b5568b643a1fcd7740eb6f2cfd54a47c3c
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 10732 bytes
SHA-256: dd28af4e5145615512945a399f06393fd4e94c673d3b1bae38148542156893dd

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