Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc36a2292d6368…

MALICIOUS

PDF

77.9 KB Created: 2021-02-23 17:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a6bfbe31e8799a4167b15a4dca0da515 SHA-1: c3b317dfb7b642fbe9b9e399c19768bdec9a0f4c SHA-256: 4dcc36a2292d63686474b9c136bcb8b9e8fe26193587b63e87d0847dace304a0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links pointing to disposable domains, indicating a likely phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a tutorial, which is a common tactic for social engineering.

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://seumenha.ru/123?utm_term=asp.net+mvc+tutorial+point+pdf PDF link annotation
    • http://stepka2016.xyz/91534789922lc89t.pdfIn PDF document text
    • http://ogranicbio.fun/fojaputavikuzitupiqxzna.pdfIn PDF document text
    • http://fuckfrsky.com/i_m_not_touching_you_commercial_sunny_dc1213.pdfIn PDF document text
    • http://italiabeach.space/gunarosavuwidakoke1txfs.pdfIn PDF document text
    • http://fitit.space/12053717351gxzrv.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/jbwheN7/pinball_arcade_cabinet_mode_key.pdfIn PDF document text
    • http://mercelus.xyz/la_misma_luna_study_guidei4t7h.pdfIn PDF document text
    • http://theboldpantsproject.com/bruce_almighty_movie_dual_audio_480pskzt2.pdfIn PDF document text
    • http://beststudent.fun/80843447031haq3x.pdfIn PDF document text
    • https://cdn.sqhk.co/velomegu/he3ihW9/pudonuwaforeme.pdfIn PDF document text
    • http://gouliwer.online/itunes_user_guide_2017tq4wl.pdfIn PDF document text
    • http://peludofnor.fun/snow_trails_maptn0hf.pdfIn PDF document text
    • http://gesoxusem.iblogger.org/38321007698.pdfIn PDF document text
    • https://cdn.sqhk.co/dimasemi/kQgzsge/40181694618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/genetic_algorithm_matlab_tutorial.pdfIn PDF document text
    • http://fidomibudirej.rf.gd/templates_for_tombstone_unveiling_invitation_cards.pdfIn PDF document text
    • http://rixuzomobe.epizy.com/simple_monthly_budget_worksheet_printable.pdfIn PDF document text
    • http://puxetixunelotaz.epizy.com/control_panel_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/python_programming_for_beginners_book.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/99470081282.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_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 5380 bytes
SHA-256: 2b5fb472d152080dbbddd2f95017f30dac2bb0945b9ac0832d4e385152583ff0
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 11100 bytes
SHA-256: e8b2a986dfc30b797ee448fdf4c8e7cc588d002793e214d6c4edc055e6bfbad9

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