Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7c651d70f4eb80…

MALICIOUS

PDF

91.0 KB Created: 2021-03-20 16:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 534580a188d1466f1cc8f850a6dbaa6e SHA-1: 9d60d609a1d6386cb63f2184166bf743a3d092dd SHA-256: ce7c651d70f4eb80cffaf8f6e5651de6d8f16c267577f6686d91b860fa4bdc4a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and external links point to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=copernicia+prunifera+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464863/normal_603482169eca5.pdfIn PDF document text
    • http://tubesebove.medianewsonline.com/xugatifajosumedunavaviju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451027/normal_5fcac0783dd0e.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/rofujizebugamaginamogiz.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/what_are_the_basic_formulas_in_physics.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/4016916.pdfIn PDF document text
    • http://zefefiwova.medianewsonline.com/jupavuwof.pdfIn PDF document text
    • http://dibubewivutuva.22web.org/luwigofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_601df33a80673.pdfIn PDF document text
    • http://likujodofefa.22web.org/is_the_canadian_justice_system_fair.pdfIn PDF document text
    • http://razagewodun.iblogger.org/novav.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/monavikosimaxetekiwunuta.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/cb6638e83.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/abbyy_gz_to.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/dj_artist_profile.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/how_to_program_baofeng_uv-5xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_60451de7aa5e7.pdfIn PDF document text
    • http://sonunevojipu.iblogger.org/pance_prep_pearls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruwevabebivis.epizy.com/nuxibesunibalekipexelonu.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/vikavopobanenurejavevadu.pdfIn PDF document text
    • http://tiwubove.epizy.com/88744010438.pdfIn PDF document text
    • http://poradenojipedu.rf.gd/formal_email_format_o_level.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_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 4844 bytes
SHA-256: 41f87be1304a360066c7c10d87d16117153a831e496e1ba0f525dce46609ed1c
font_01_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 11488 bytes
SHA-256: e57a93ea77a5c5dd0c4f5e7ee0292fff50ce7f1ee446b11bc5e291665ef08b73

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