Malicious PDF — malware analysis report

Static analysis result for SHA-256 1616877efc60cce5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 23:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d502b5c972a830672e03b5f365fc9cf6 SHA-1: 00feed2a2ccb84fcdfab011ea662d444dce5238b SHA-256: 1616877efc60cce5a2c9e3450878fc0ef8caccf093856716a02060828e8659fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, containing numerous external URIs pointing to various domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=anthoceros+thallus+structure PDF link annotation
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/17147126410.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/ketunopewinaga.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/64895356625.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109101253397900.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/42206244184.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dokoniwokapaboj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318368cd00d---93176348103.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/72181885603.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/zikikunasobalev.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/45260063173.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/nilotamatoxonebisa.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/dijabesonapizasulal.pdfIn PDF document text
    • https://parfumzone.ro/files/file/1536926814.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109101247576584.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3d4b317167c66fcd74e38566e7bb5bd1/tasudalevav.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/43615901905.pdfIn PDF document text
    • http://tlznailspa.com/media/files/faxib.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/90815961843.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/74489616722.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/11458550826.pdfIn PDF document text
    • http://bastola.org/userfiles/file/xobosajabakizituvebe.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_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 16828 bytes
SHA-256: 0ea022d9cf5a485ef797d043d763f3e5f56ca9a3ef0480c8fe66023173e358cd
font_02_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 10316 bytes
SHA-256: c42e0c096f7c8ebee4ec7e78915316369af2ee988d21d540ab6d73256b083b69

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