Malicious PDF — malware analysis report

Static analysis result for SHA-256 81af5873fddaa2d6…

MALICIOUS

PDF

73.9 KB Created: 2021-03-24 09:19:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f7675190a0e5916bbf5ec4f1a9039196 SHA-1: 25920993273e07a74708b96ffcdcb27440ca85c2 SHA-256: 81af5873fddaa2d69652cdeaa7f62a13f635927938b51189f627bbd5419b87d6
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, suggests a lure related to 'ppt templates for teachers', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=ppt+templates+for+teachers PDF link annotation
    • http://premial.su/707763427819ke2j.pdfIn PDF document text
    • http://lishop.site/84020588490f8d9w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_60538faea70ea.pdfIn PDF document text
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/womunoloxariwupixa.pdfIn PDF document text
    • http://50offshop.info/elite_air_fryer_reviewsr4kq5.pdfIn PDF document text
    • https://vipekisurular.weebly.com/uploads/1/3/1/4/131453387/lutekexefalered.pdfIn PDF document text
    • http://doordash.fun/pujisipimilorunajepolnyz3c.pdfIn PDF document text
    • http://beamorem.com/best_4_stroke_weed_eater_with_attachmentsxui1i.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/daxisexaje_fewuzabema_sorijuto.pdfIn PDF document text
    • https://vovinusowoxojik.weebly.com/uploads/1/3/4/3/134349833/f90acd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_60571bb7518f1.pdfIn PDF document text
    • http://paktum.pro/pressure_washer_hose_repair_connectorsyxcb.pdfIn PDF document text
    • https://pefeduvoxonix.weebly.com/uploads/1/3/4/0/134017609/8341919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464522/normal_605aaa899fc73.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/gupafesegobumuv.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/nivujufe.pdfIn PDF document text
    • http://xruhdfo.site/97766259091z1lcv.pdfIn PDF document text
    • http://apelsins.space/mugizuwabigix37fvp.pdfIn PDF document text
    • http://fruit-italy.space/12498722985txg9r.pdfIn PDF document text
    • http://podipotekoi.ru/garmin_s62_instructionsm39je.pdfIn PDF document text
    • http://weinmvc.net/war_of_the_worlds_musical_tour_2020kb8am.pdfIn PDF document text
    • http://csxmoney.info/can_you_escape_room_tampa2n1jg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_60254e6f0c08b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 5256 bytes
SHA-256: 673eadb9eb6515f7a6f7322cce6233b46eee90ee2beaf19b6b414972dc1aaee8
font_01_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 10468 bytes
SHA-256: b776e61a2a3954a13e16b2e6dae40be917f0dac038aaacadcb52414949d6e4f0

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