Malicious PDF — malware analysis report

Static analysis result for SHA-256 f870766704126cbe…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 08:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98f64722beb4b1e65f2e905f46667731 SHA-1: 785fc5ae3e0279fff487060ae82ff874051fa2c9 SHA-256: f870766704126cbe09fd161f61cf9257a40f478ce75001fb580e84560fec8509
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=advantages+of+new+technology+in+the+workplace PDF link annotation
    • https://biogenetixpharma.com/ci/userfiles/files/52366739799.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/56733603091.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/87062550953.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/46357485154.pdfIn PDF document text
    • http://nincity.de/inline/file/gexowuzoluluti.pdfIn PDF document text
    • http://edituj.cz/res/file/likowulatirojenel.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161318becdb571---62387316763.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/tirade.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/4106756807.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4791e719---mijipovapusajufejumok.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/35523535357.pdfIn PDF document text
    • http://erimti.com/userfiles/file/35617955627.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/10737590207.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210910_065528.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/vorevexivo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/857f5b146f9efa2bd95796e0edd8ecde/93980134000.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/dezezozetetunegisek.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/98849487919.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/80124365867.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/lazetozabolaredurixiliru.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210919105437.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/29667953097.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/gitiwogotogasevukigekan.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/75274657263.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 17276 bytes
SHA-256: a377d3a2fbc2435eb7428eda8d5742f5bdd056fa9d9db00947ae0fe60caeb7d1
font_01_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 11240 bytes
SHA-256: e7582220d421d100fe93ffb8909348d949552b766ad09630b81420e445249cbc
font_02_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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