Malicious PDF — malware analysis report

Static analysis result for SHA-256 c961b1ce3a7a27d9…

MALICIOUS

PDF

77.0 KB Created: 2021-05-11 02:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaef8e33ecb3735ca04bcb9b4ddef6f6 SHA-1: e68fc5a2cfde9e1c773eef833ff642bfc214756b SHA-256: c961b1ce3a7a27d9f0a1b7ee864f811cae4e5ced3089cb0b6dba8f79adbb1a8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to password resets, aligning with a phishing lure.

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://gimoguvi.ru/strik?utm_term=cisco+linksys+e1200+reset+password
    • http://waxevamebe.22web.org/29806261111.pdf
    • https://boserizozililo.weebly.com/uploads/1/3/2/6/132682878/1010255.pdf
    • https://xudidetopos.weebly.com/uploads/1/3/4/5/134579215/nijekali_xored_vajijixonezi_fabizo.pdf
    • https://cdn-cms.f-static.net/uploads/4383802/normal_600c5174112c8.pdf
    • http://ketotreno.buzz/85766782347kmejz.pdf
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5fdc2ebfc1e91.pdf
    • https://cdn.sqhk.co/pubabolab/dQi3fto/beat_cop_apk.pdf
    • http://stav-games.ru/does_roku_xd_still_worko5gqx.pdf
    • http://dirtygirl.fun/guzafofekuxanotmoh0r.pdf
    • http://fb-ig-copyright.com/xajagpoi1e.pdf
    • https://zisinifaja.weebly.com/uploads/1/3/4/5/134599776/179c103.pdf
    • http://ens-pictures.ru/how_to_install_hp_photosmart_d110_without_cdvj2ym.pdf
    • http://nout-sale.site/29427558290hu3k7.pdf
    • http://gladkoe-telo.xyz/tebijiwonawarezoravz1z1t.pdf
    • https://cdn.sqhk.co/gifexajed/haogjha/1851826015.pdf
    • https://cdn.sqhk.co/konafomaz/jggdMCp/52566447817.pdf
    • http://inertbhjbj.ru/2833018373105gqr.pdf
    • http://natgood.space/tusowabezuboluweduwanepckxqp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kurufodoji.rf.gd/63762429279.pdf
    • http://laxuraxosolun.epizy.com/assembly_line_game_ios.pdf
    • http://mevekanuz.epizy.com/android_version_nexus_10.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_off0000defc.bin
2f72d466c1a16647113b517effcac275d598aa4a201f3802310c2a53999c00b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 5460 bytes
font_01_sfnt_off0000f1b1.bin
197f1cd62b3c89acf4c368c32ef1cdd29e92a497fda319b24e1750e8b2e83486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 11452 bytes
font_02_sfnt_off0001187e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 4324 bytes

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