Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90b12543e8b2b04…

MALICIOUS

PDF

80.3 KB Created: 2021-03-23 17:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be5e54f4b61c95b4117efb8314541d43 SHA-1: b0d434284cfb9db23097545eeb5a29b5520d2c7c SHA-256: e90b12543e8b2b04da3486f85139651f16ea83ec3195b861f0826026c6e7da98
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://lozipotod.ru/strik?utm_term=listening+skills+activities+for+5th+grade PDF link annotation
    • http://lnstagramverifiedsbadgeform.com/tamil_guide_7th_freepi0dd.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/gd60uOk/new_york_city_guidelines_for_mold_remediation.pdfIn PDF document text
    • http://totalcreditcheck.info/how_long_does_a_toyota_rav4_battery_lasttmz41.pdfIn PDF document text
    • http://importants.space/star_trek_the_next_generation_season_7_episode_15kza38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489045/normal_60009934b1eda.pdfIn PDF document text
    • http://uptodate.site/1268065691mjuc9.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/five_nights_at_anime_game_android_downloadwj5fr.pdfIn PDF document text
    • http://mabay.fun/wobitizaxirekutowejgu1vc.pdfIn PDF document text
    • http://leftoutclub.com/bts_bon_voyage_downloadfmvit.pdfIn PDF document text
    • http://ehaberdevlet.com/2865279017proam.pdfIn PDF document text
    • http://sreda.city/seek_thermal_compact_vs_flir_one_pro_ltbrnxj.pdfIn PDF document text
    • http://artyom.guru/sandisk_sansa_mp3_player_chargerhkxw3.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/igeaSgg/skater_xl_review_2020.pdfIn PDF document text
    • http://supsun-aero.com/dewalt_xtreme_12v_max_cordless_drillnjdk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_604e0a4bb4419.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/jhcu5gf/72121115174.pdfIn PDF document text
    • http://securityverifiedservices.com/35847910325l67d9.pdfIn PDF document text
    • http://top-odejda.com/honda_manual_transmission_fluid_change_intervalo0jb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_80f986c7754e4cf89ea0e15fba7218c0.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_e906dbe37b554f88a6a21bbebb782969.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_216630cef6084c3bb4f8e599082ec38d.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_8b87990e059b4f0986c2cfeea8b61ad6.pdf?index=trueIn 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_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 5472 bytes
SHA-256: fe89839a2baad77781372a643380d6e08c62c3da8553fb66d459ad6eb78c85f7
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10936 bytes
SHA-256: a341badbdec0308fef62da10599143407e5e283094e1e8ef9311aa71e4f518df

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