Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3be187935d722d9…

MALICIOUS

PDF

83.8 KB Created: 2021-03-15 16:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2ce1cce122f67a0163481e3ef44b5f2d SHA-1: 198c0c19e401cbcd1039c5e3e70754bc48e998fa SHA-256: c3be187935d722d910924344d8069529495afbd07632a9e2c3f088bdc6486d68
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The document's structure and numerous links indicate it functions as a link farm, likely to obfuscate the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=multinomial+logistic+regression+spss+pdf PDF link annotation
    • https://cdn.sqhk.co/dovoxukeni/jesjfjh/bitoxex.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/cejh3hf/rifajalabawolebom.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/metro_2035_audiobook.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/49218154932.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/2MjfggV/gixusivutubujetavasivu.pdfIn PDF document text
    • https://cdn.sqhk.co/zesunotu/JnGiaFK/tixazis.pdfIn PDF document text
    • http://penageli.getenjoyment.net/manual_d-link_dir-605l.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/gjPrjgp/dark_green_bubble_jacket.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/69129115491.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/3547571471.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8e985b84-f336-4757-86d8-bf3f50c95819.filesusr.com/ugd/cac9e4_65567a4eab3645aba75346cbe241786e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c1e1ae-3cc5-48bd-927c-4fdc867e1b46/what_is_the_theme_of_the_novel_esperanza_rising.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/witorebujalumopemej.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/ledanetasanuzubinek.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/vanojigepi.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_ef0cc0d5ebd4420e9fdd6dcd36755296.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_5254e2f675404ea185f43e1ceae03ba5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/danganronpa_1_school_mode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849c50cd-0ab1-4ebe-b49f-79cdd6c7fc0f/liftmaster_garage_door_opener_the_professional_line_1_2_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/49438555837.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/best_short_stories_collection_books.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_2819ad5c235a41ffae772afdf84b9bbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/wurarofotekuvamis.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_f3258cbe969745848257b04e700dd2b0.pdf?index=trueIn 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_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 5360 bytes
SHA-256: ec5c26a85a54e6fe1082a74ce5d526649f74336fb702c335af69583dfedbf430
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 11188 bytes
SHA-256: fd2e51dbce2ea567a0fd69fd717ae63d948d21196e9b161f483b9300e1b47532
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3