Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64888cccbebf2c7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 14:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82132e8622698be012e2139d29c2163f SHA-1: 866a58d31549908943930fd47a556420a7cf934c SHA-256: a64888cccbebf2c7ad18a9a97dc78abfc52a7f4b88317b242237d2d83718223a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to potentially malicious or disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is designed to obscure its malicious intent rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614700a58438d---26629712692.pdf In PDF document text
    • http://shriramashramssschool.org/userfiles/file/badifovive.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mefimunadeka.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/81605487184.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/wugojibabutarobedaba.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52253575714.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/87637883477.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/wulixavos.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zumidexezeroralilorokupus.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/falegebotika.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/6408666321.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/68063500068.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614d44597bc15---94204279762.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/bedotedatoxepilawogisive.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/15336382107.pdfIn PDF document text
    • http://scantech3d.com/files/nifotibagepelodemokijodo.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/44408186864.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/xotiparidikotiboni.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/147383890.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/deriledewoloroloxepokikuv.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/kuzejobonaguwalofe.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13716126538.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/85784300370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=apa+itu+vpn+androidPDF link annotation
    • 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_off0000b60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60F 17960 bytes
SHA-256: 99bca7f449943f8850f77bb659c8da664ec131b5a4aef1cc5e543bf14a7ad34b
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 10184 bytes
SHA-256: 1fc9be42de487e09353044cd73007c7e6eb372b600fecd13ad10c2c0de380ddf

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