Malicious PDF — malware analysis report

Static analysis result for SHA-256 1838512006da4e16…

MALICIOUS

PDF

83.2 KB Created: 2021-02-23 18:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 37eba92aede901f2e51379f7b6537bee SHA-1: c2764aa16252048db1edeac214bc7a1555341e0d SHA-256: 1838512006da4e16c8ac4fa639d809bcf771e597b93f82f8ff62e78bf4839888
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to trigonometry formulas, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/strik?utm_term=inverse+trigonometry+formula+class+12+pdf PDF link annotation
    • http://lozajakar.iblogger.org/fotaguzevofimadomod.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/9738516.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/gjjjGhe/thronebreaker_the_witcher_tales_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff2254fd6917.pdfIn PDF document text
    • https://zovamegazojuji.weebly.com/uploads/1/3/4/8/134849063/milepexa_terebajix_vinasiru.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/how_to_hyperlink_between_sheets_in_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/Pjajjgg/88096597860.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/patakabuwedutivegojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_5fd6268ab40c4.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/iibhijf/indonesia_drag_bike_racing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5fd7889cd994e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_603419e716001.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/ZhdAHSZ/star_wars_rebels_season_3_episode_3_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/77267597204.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/66360892892.pdfIn PDF document text
    • http://numivonef.rf.gd/jidizorelamikop.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/28664502160.pdfIn PDF document text
    • http://tajegigug.epizy.com/jukata.pdfIn PDF document text
    • http://sawutekoxa.epizy.com/how_to_adjust_liftmaster_p3.pdfIn PDF document text
    • http://xoxobesoxiti.epizy.com/print_exercise_14_microscopic_anatomy_answers.pdfIn PDF document text
    • http://zevizajezu.epizy.com/golarivararulokomokemegon.pdfIn PDF document text
    • http://zubeleboju.epizy.com/zujoxuranudazexeloze.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011862.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11862 22340 bytes
SHA-256: c1af34bf1561cdd86cf23d9ed9ad05470b5d38c9eca12b8823bdf4dad1a2ff82
font_00_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 5760 bytes
SHA-256: 73191183292bbda78061e7031e87e4b815d7c793e777f31908af77bd17d97634
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 11152 bytes
SHA-256: f3896d68b6da5da997848b172aa19fdccf274c2f4898716391634a3470e1ba2c

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