Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bc278d83edad65…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 10:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09c571b66ba66d47fbb30a9f1a632578 SHA-1: dc0e5dfdab475341df0709c00c1feab98960f706 SHA-256: 85bc278d83edad655fdb0773e67c05c73898203b380b43d889b38715bc248a40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of phishing or malware distribution campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links on low-reputation domains.

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://synerhu.ru/uplcv?utm_term=read+wrath+and+the+dawn+online+free
    • https://nusbetaja2.com/contents/files/masotozoxuvo.pdf
    • https://activepymes.com/pub/file/75685740776.pdf
    • https://maymac.info/userfiles/file/14037556845.pdf
    • http://bbfederico2.net/userfiles/file/xoluka.pdf
    • http://123podkrovie.sk/editor_uploads/files/98781422867.pdf
    • http://bixenony.com/userfiles/files/burinupipuxekuxaje.pdf
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/18736015366.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/juden.pdf
    • https://gancza-yacht.pl/userfiles/file/xoxigomapetoligon.pdf
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/javevemurerixelokisaduv.pdf
    • https://fairtradeportal.pl/userfiles/file/sefupegetizokoribako.pdf
    • http://maynenkhiinverter.com/media/ftp/file/14673875593.pdf
    • http://primeasset.hu/fileok/file/vekitukivutifepowoxirib.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/sowijixa.pdf
    • https://gres-k.cat/userfiles/file/sebokidosokamesumu.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/97089827393.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/ditusidegivetesaxat.pdf
    • http://ngocvietbungalow.com/upload/files/witaneritameloba.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/xonakemunutowuvatidako.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161412e0667e74---mutozanizivag.pdf
    • http://bharatandcompany.in/ckfinder/userfiles/files/66705968588.pdf
    • http://yh-nutri.com/filespath/files/20210905042818.pdf
    • http://skulpt.in/admin/uploads/file/savoga.pdf
    • http://www.ekoforte.com/upload/file/razexexivupoxipagoni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead8.bin
7b06588a8c01f04cf2b13f3094c00b1642c5197fe7edaa092915755df6759e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 18084 bytes
font_01_sfnt_off000119b1.bin
5804afcadba1a06f1c2e7edb817f0d4d11352895bb376d2ad43cb9f311031b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B1 10412 bytes
font_02_sfnt_off00013131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 16792 bytes

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