Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d5dd59c71d91b1…

MALICIOUS

PDF

73.2 KB Created: 2021-03-15 20:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad5b747c64685f4a3bab804e78e3753 SHA-1: 55531d35c1f44364227084463c96712f9f1d88ee SHA-256: 63d5dd59c71d91b12d32dc4134156cdf4936ac64bee3e67c0c36b045fb955abf
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains and file-sharing services, indicating a likely phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure malicious intent.

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://dafemum.ru/award?keyword=pdf+splitter+macro
    • http://xexapitanegis.getenjoyment.net/mipitajaki.pdf
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/55004.pdf
    • http://nitiwopororotef.mypressonline.com/blank_answer_sheet_1_50.pdf
    • http://tujemet.scienceontheweb.net/61747005336.pdf
    • http://nanamojuvimujo.medianewsonline.com/notre_dame_fight_song_sheet_music.pdf
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/8096477.pdf
    • https://cdn.sqhk.co/votezevon/Phhgid4/super_penguin_league_2019_full.pdf
    • https://cdn.sqhk.co/fifotadog/7khgZYc/bioplastia_lowell_tem_formol.pdf
    • http://zojidetamosab.iblogger.org/tojadexibevijazejitetot.pdf
    • https://cdn.sqhk.co/nezuxada/jhijiOw/zoruk.pdf
    • http://sipipewawezizuf.getenjoyment.net/the_secret_rhonda_byrne_movie_online.pdf
    • http://salizurewaki.mypressonline.com/calories_burned_doing_200_jumping_jacks.pdf
    • http://zemesod.getenjoyment.net/dnd_unearthed_arcana_artificer.pdf
    • http://bezerojiw.scienceontheweb.net/dikomapinokifun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dojafeduzig.myartsonline.com/types_of_exercises_for_seniors.pdf
    • http://bizekeravafixe.rf.gd/fiszki_angielski_b1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9e.bin
b77f9881969b8edb74efb454486fb2a05ae61a103e289e57c884aa652b2f82d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 5300 bytes
font_01_sfnt_off0000f193.bin
f48409a3c3dcde341bebd111966948c7af4f6784f8cacfeae30f82d428df9ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 11208 bytes

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