Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6318976d4322df1…

MALICIOUS

PDF

179.7 KB Created: 2021-06-01 02:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c471b6ef848ff3b8ffa988c7d2359325 SHA-1: d2a5089ecac501f0cf36f0b92f1161245f798ea9 SHA-256: d6318976d4322df1f59b5740c1dc3ea62780970483ca6ee9f428c51fb8631873
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external sites, with one specific URL identified as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards a social engineering attack to drive traffic to the malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=3+bahadur+full+movie++480p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475995/normal_6032e5a2844d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_6056d5ac4b1a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fe7c4bd7d018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_603ffe8809e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_60291e454c837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_606c6502be339.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/50de742e-25be-410e-97f3-2f18637d8698/9734256989.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422442/how_to_set_up_dmx_512_controller.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/74870125501.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144427788/how_do_you_light_a_pilot_light_on_a_baxi_boiler.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144428865/1v1_lol_unblocked_games_77_ez.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144428505/how_to_check_vehicle_fines_online.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144428514/online2pdf.com_to_jpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09351243-96f2-4a55-9314-e7a268a4fd72/76514884924.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/jugaralumamapunomos.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_off00026b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B88 5796 bytes
SHA-256: 94906c6f8097ee8681057bbae6a0af1754fec7e23ba37a20c5871c0d58870165
font_01_sfnt_off00027f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F1B 13232 bytes
SHA-256: 1b1fcbea2ad0db1414f1c1095413d8e9cfb339a7645a7b69c417a9571fac3cd1
font_02_sfnt_off0002aaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AAA0 16452 bytes
SHA-256: 9eedbf0422e6a2eca063c485411e9de0e9185d964423c125a353781f2b7a6bec

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