Malicious PDF — malware analysis report

Static analysis result for SHA-256 022b2c81b6f00082…

MALICIOUS

PDF

91.6 KB Created: 2021-03-21 02:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78921bb7ce26180cc106c74a4476cddc SHA-1: eb7734e6414653d1f8f781c374352a38dbe7f798 SHA-256: 022b2c81b6f0008224da5420fcd433e294d816d18b95b163c05fc81e236f71df
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, indicating a strong intent to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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/strik?utm_term=skinny+fat+body+type+female
    • https://cdn.sqhk.co/madumubo/ticYdji/98339365372.pdf
    • http://jalazekesofijot.medianewsonline.com/17899690693.pdf
    • http://pigigozoruda.mypressonline.com/structural_adjustment_programs.pdf
    • http://gilumesu.mypressonline.com/tekixoz.pdf
    • http://vorakumezaxof.mygamesonline.org/garmin_etrex_10_user_manual.pdf
    • http://wedidizelajat.mypressonline.com/xiderawonudozud.pdf
    • http://jolijivik.scienceontheweb.net/71094754748.pdf
    • http://sesalon.xyz/56847798841vkh7v.pdf
    • http://megopoveguvujal.medianewsonline.com/pebegewulowig.pdf
    • http://sarhello.online/applications_of_artificial_neural_networks_for_ecg_signal_detection_and_classificationsp43u.pdf
    • http://obuv-kozha.ru/tixagavaxiql354.pdf
    • https://cdn.sqhk.co/xiwasazafu/pGOvhhl/22772757154.pdf
    • http://tigibisolefora.mygamesonline.org/libro_los_de_abajo_de_mariano_azuela.pdf
    • https://cdn.sqhk.co/wigalefu/hbuxfha/3927324363.pdf
    • https://cdn.sqhk.co/jabosuve/3muSmuo/19400732963.pdf
    • https://cdn.sqhk.co/dutaxato/3sdo6ii/bejojesuxomesopimulugevet.pdf
    • http://dowotezovemalo.mygamesonline.org/bailable_and_non_bailable_offence_crpc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zogoxuf.atwebpages.com/xefokamepix.pdf
    • http://jokosen.atwebpages.com/xanituzaz.pdf
    • http://bufijonewufo.onlinewebshop.net/can_you_program_xbox_one_remote_to_tv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ed4.bin
77524f5f7c60f2dab01e35839c021c087b447b718a4afbdcba028d1ca17dcc01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 5320 bytes
font_01_sfnt_off000130e6.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 1800 bytes
font_02_sfnt_off00013974.bin
eda590c7a16a53a375ebc66ae0283204e6ed0f3b9a7244e129299618aaad1536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 11008 bytes

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