Malicious PDF — malware analysis report

Static analysis result for SHA-256 78950373b587365d…

MALICIOUS

PDF

68.6 KB Created: 2021-10-02 13:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 964b95e136fe9d8f39063d0bc7e8bd0c SHA-1: 41f8cb1c7a23e34090140d55dcde85fd6fec470d SHA-256: 78950373b587365d3724a39a8287fe8d994fa4db1aca9abff4e7029020eb15b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=class+11th+business+studies+chapter+1+notes PDF link annotation
    • https://limberhurstgallery.com/imageuploads/file/55255844038.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/kezurexozalomikasuvorav.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/55533610713.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/76711808606.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50844637200.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/41735760012.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///falowizevebamerudolase.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/maxiziruwiralomas.pdfIn PDF document text
    • http://arsvet.ru/img/upload/27007795442.pdfIn PDF document text
    • http://klemanpince.hu/files/file/xilagij.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/28073359283.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/gikepa.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/punibukesixu.pdfIn PDF document text
    • http://shamayachts.com/upload/file/zalelek.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rezilatunelidob.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092423114612.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mevorajufoxunopoxewogu.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/norazavafokuxobugamugipal.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/56273722996.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/rixubiwogevagozivutunu.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109290449306986.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_off0000ac21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 10932 bytes
SHA-256: 9dfb70bf36e8a0420c36ad2136fe65184893656f19cecb12bac3850b2c10e282
font_02_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 15580 bytes
SHA-256: db465478facb591d82ca6395a7fd530b9fc23d849f6532bf0de7c53d97c10a27

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