Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e05bb693158df1…

MALICIOUS

PDF

73.5 KB Created: 2021-03-05 01:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e7c19fc49cc0e2ec2783baedd02d459f SHA-1: 63179b8dfe85cf03b70a1830942ba8a37741feb6 SHA-256: f5e05bb693158df17bd24e61a7824a0f3e76ebf843b9378dbe84340b2ac9bc37
126 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=what+do+economic+depression+mean PDF link annotation
    • http://hookup671.site/fallout_4_game_manualdw3zb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404123/normal_602939b281d72.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/xaravirutokugawapepop.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/how_do_i_activate_my_proform_505_cst_treadmill.pdfIn PDF document text
    • http://lozomaneje.getenjoyment.net/pojagumakavixidij.pdfIn PDF document text
    • http://magazinrf.xyz/cavernous_angioma_malformation_radiologyx24en.pdfIn PDF document text
    • http://walefufezaromaj.iblogger.org/fuzij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_601df7744d2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fd37bb22a03e.pdfIn PDF document text
    • http://botojagi.iblogger.org/yiruma_kiss_the_rain_sheet.pdfIn PDF document text
    • http://kifikawi.66ghz.com/notting_hill_soundtrack.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/xibekorajelova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6025ce7cf3ced.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/how_to_analyse_graphs_and_charts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badokelo.rf.gd/adenovirus_equino.pdfIn PDF document text
    • http://terajupatasan.rf.gd/57904929519.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/how_to_fight_hand_to_hand_in_cyberpunk_2077.pdfIn PDF document text
    • http://tuzugewidided.rf.gd/class_12th_chemistry_book.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/36226965448.pdfIn PDF document text
    • http://jenizigigeno.epizy.com/ferixusujotiwuf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 5296 bytes
SHA-256: a1ec40c314fba788c3c6448b2a3dfd6448974817ac5fe720a0731754d9c10c37
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 10920 bytes
SHA-256: 7b2afa0314cff0f0cc35c6f13ca7b41d814132cb53b2eff628955fd1b22a10cd

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