Malicious PDF — malware analysis report

Static analysis result for SHA-256 3837f4009f542ae2…

MALICIOUS

PDF

80.6 KB Created: 2021-02-15 07:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 42f6d340ad1da2dd44d9a1f24217ba79 SHA-1: b3b92aa9ec9c40bb142f1bd244e77e517b46450a SHA-256: 3837f4009f542ae23924a128f10b1b078d34a8db1a9980b894022e038118562b
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that redirect to potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The document body, though heavily obfuscated, suggests a lure related to 'Plugin adblock chrome android'. The presence of multiple external URIs and the ML classifier's high confidence score strongly suggest a phishing or malware distribution attempt.

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://maypoin.ru/wb?keyword=plugin%20adblock%20chrome%20android PDF link annotation
    • https://cdn.sqhk.co/bikegola/hik3Wje/zudesojezug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fcc6f704eb62.pdfIn PDF document text
    • http://sreview.online/change_text_pythonlmjyr.pdfIn PDF document text
    • http://fartook.online/46506033670bxmwt.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/t06ggii/3478863612.pdfIn PDF document text
    • http://idealsit.space/inquisitor_martyr_crusader_bolter_build90rtq.pdfIn PDF document text
    • http://theboldpantsproject.com/lamborghini_song_320kbps_pagalworlddmrqt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_600b9eda6b1d5.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/ighBjgc/monster_shooter_game_download_uptodown.pdfIn PDF document text
    • http://wellwork.site/xisuxipimibusek0epdv.pdfIn PDF document text
    • http://vclean-sale.shop/98818638799zh569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_6002950add093.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/jdySiaE/nimukelozozemi.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ibhfjfM/bamavup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapaporetakik.epizy.com/bad_words_beep_sound_effect.pdfIn PDF document text
    • http://wokixewo.epizy.com/vigudupapejedibevi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 5380 bytes
SHA-256: b9e12f63a4a210f783199ce42b8d8063e910a245737fb986785711fa107f130d
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 21772 bytes
SHA-256: cc4d4e55308ceac3686a11560e660d69278912a9affd86ebf672d4e5ed3be0c8
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16140 bytes
SHA-256: f971a1137535dae827f718fbcb51d92d51e9ff18b10af3debd815d23b7199b40

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