Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bbe78b5d37e7ac…

MALICIOUS

PDF

73.6 KB Created: 2021-02-27 11:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1927e859a838874fda293fd69c048cd SHA-1: e77bfd15e15c770cac581cceeba67c250434866e SHA-256: e9bbe78b5d37e7accea827b1ad147cf48c8ffb52947e82a17e860ed1d0e6803d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to various domains, one of which is https://kuzutuzo.ru/aws?utm_term=ecers+book+online. This pattern is consistent with phishing or malware distribution campaigns.

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://kuzutuzo.ru/aws?utm_term=ecers+book+online
    • http://lapitubemexidi.mywebcommunity.org/38052399784.pdf
    • http://tapozifokun.mywebcommunity.org/kumegasoni.pdf
    • http://nakrutkavk.site/376295859320wr9p.pdf
    • http://falisekivi.iblogger.org/lowem.pdf
    • http://xitawefavam.medianewsonline.com/star_trek_next_generation_cast_season_2_episode_6.pdf
    • http://jekefidaz.mygamesonline.org/figurative_language_dalam_puisi_the_road_not_taken.pdf
    • http://leledup.mypressonline.com/kopajumasamebenedejiwax.pdf
    • http://werikipirojenob.scienceontheweb.net/xapijej.pdf
    • http://lololoj.sportsontheweb.net/25220842717.pdf
    • http://mufutekuson.getenjoyment.net/power_air_fryer_10-in-1_pro_elite_oven_6-qt.pdf
    • http://tebapewulodafe.getenjoyment.net/kurzweil_pc88_owners_manual.pdf
    • http://amaryllis.space/mewonepetupp5pb6.pdf
    • https://cdn-cms.f-static.net/uploads/4489414/normal_602861c3bf503.pdf
    • http://fuvufurewuf.iblogger.org/59451689888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kavibajegis.onlinewebshop.net/lineas_horizontales_y_verticales_para_preescolar.pdf
    • http://sivuvupaxiju.rf.gd/16020074647.pdf
    • http://kofaxafogi.myartsonline.com/27052659915.pdf
    • http://lebozid.epizy.com/5e_undead_dragon.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_off0000e56a.bin
ebde2a39e2f5d9f516803cf14b13399f45035e9b089bfadfd31d5aca0e8892b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 4744 bytes
font_01_sfnt_off0000f5a4.bin
89ce5adeacac637cfa29b5f771a0ed5c542655b045321b235afe269338d24996		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10460 bytes

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