Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe5d52bb3410467…

MALICIOUS

PDF

98.9 KB Created: 2021-03-31 03:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4dfac2519e529aec33c6471f3b070784 SHA-1: 27c09be961cf76fcb05dc97069a3dbbf586b3ffc SHA-256: fbe5d52bb3410467aee1888e8fe15e30ab15d528df678d7a07cbdb9a60be2c73
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious destination. The presence of external URIs and the ML classifier's high confidence score suggest this file is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://xezojetit.ru/award?keyword=aptransco+syllabus+pdf PDF link annotation
    • https://cdn.sqhk.co/vapumojemov/cAnVgfL/58939959663.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/p6haozV/31791743097.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/75167294766.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/how_to_grow_butterhead_lettuce_from_seeds.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/v2rgjV5/narazefazu.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/chejdjh/jebun.pdfIn PDF document text
    • http://waverufusufafuv.scienceontheweb.net/zenolibinudijomarorunu.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/NEWjeif/color_circle_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377909/normal_5fc69a8dc0557.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/jygcngf/hoop_academy_basketball_camp.pdfIn PDF document text
    • http://govejulij.22web.org/99006050203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_5fd31c6468ec1.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/vhhHigX/31874549419.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/crmg95Y/carrom_board_game_online_y8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413240/normal_6005e5271fb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_6044942b98759.pdfIn PDF document text
    • https://cdn.sqhk.co/jutepoxof/cN7hjkX/alivio_berwyn_covid_testing.pdfIn PDF document text
    • http://gojepifega.22web.org/artemia_culture.pdfIn PDF document text
    • http://legalevi.22web.org/19817624516.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/31a7bb74-290c-452b-bf4d-832095589984/resunodipoxomupagip.pdfIn PDF document text
    • http://gajopule.myartsonline.com/mukobajulipoxi.pdfIn PDF document text
    • http://gedonisezif.epizy.com/zolozaraxuwomodego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be7457a-83bc-4547-bc35-0b42186a862b/tafadujazijaxaraji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1e3bfb-07c5-4999-84fe-d5ea74e1a527/possessive_adjectives_english_exercises.pdfIn PDF document text
    • http://rugakerupu.rf.gd/zirinova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad17d187-cd8c-46c8-8e56-b52c6373b421/milositavadozibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e34f5ee-b1d7-4298-89ea-4cdadba51f6c/nixedanobifavema.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_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 11916 bytes
SHA-256: 7327495ac7ff58ae5276ce3a901f2da9258e0ddd92f3f7b21697c152665741c1
font_01_sfnt_off00012de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE2 5380 bytes
SHA-256: 3d057d8e4d004ee2ea3fdd7fddd925a59943d191eb5baeb0a0e949205a3f538d
font_02_sfnt_off0001403e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403E 11796 bytes
SHA-256: 2f755c569c5dd34b5ac4a042321c3a9bad4deca78aecfc43959fbc71863857a6
font_03_sfnt_off00016853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16853 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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