Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f54b13d6411a837…

MALICIOUS

PDF

81.5 KB Created: 2021-03-01 06:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 789ac30458d1c8eb024248bc3ad2e1d8 SHA-1: 30534bb0da25dd21a8fcccf8373050c75ed0fc71 SHA-256: 3f54b13d6411a8376509d74887603bdb89ddd34134a76622f9c54575dbdfacdc
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to online degrees, suggesting a lure for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=public+relations+specialist+online+degree PDF link annotation
    • http://bidizujimon.getenjoyment.net/90422948739.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/vijukugerom.pdfIn PDF document text
    • http://stopnutristrike.ru/bixobeeg9cs.pdfIn PDF document text
    • http://firstreadersclub.com/nokotoregafoz7n2el.pdfIn PDF document text
    • http://ionatr.space/kenmore_elite_dishwasher_wont_power_on01bow.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/wuvural.pdfIn PDF document text
    • http://pogumuwoma.iblogger.org/4623211614.pdfIn PDF document text
    • http://neo-tp.ru/unsecured_notes_payable_on_balance_sheet7gu5p.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/crossfit_wod_workout_plan.pdfIn PDF document text
    • http://faxadiweruxu.22web.org/fenufinil.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
    • http://muxolisakij.epizy.com/florida_notary_acknowledgment_form_sample.pdfIn PDF document text
    • http://balupamujoti.rf.gd/94608250464.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/think_through_math_answers_8th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/cara_vsco_cam_fullpack_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/video_converter_to_mp4_android.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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 5264 bytes
SHA-256: 5073f824da60172d099250994fd2e0b4163d2959eb1b55aae9e299c20eb8699c
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 10240 bytes
SHA-256: 52e6e169edcdb08a37d4e6ff3cd0438dffe6b16d9f36e58f31fb6645d7cd75f5
font_02_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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