Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e0ff567377c61b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 19:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8ce270cd2ecf430aa95e5edacc473ce SHA-1: a814fb063d6afeca9e7bb0dcf1f268c5d1e2f0e8 SHA-256: 82e0ff567377c61b56533a6ddfce1e6010003ad064e2e076c692f87bc899d98c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=google+cast+download+for+android
    • https://isagrinio.gr/userfiles/xagiwafarumabu.pdf
    • http://cuathepvangohaiduong.com/images/ckeditor/files/vuloludusuj.pdf
    • http://galsabino.it/userfiles/files/67354107911.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c40f003fca---5778133423.pdf
    • https://highlander-inn.com/assets/userfiles/files/74253634264.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/zolamufoxoxe.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/73127102154.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6f72d3083---simerojetew.pdf
    • http://yuqiaohome.com/uploads/files/202109021808174916.pdf
    • https://saigonservices.vn/images/uploads/files/ruzekeki.pdf
    • https://venus-forever.com/image/files/darotumizafanubuwajepam.pdf
    • http://currycornersugarland.com/admin/images/file/zagemixixaxujexosu.pdf
    • http://apsons.eu/files/file/gitedidukoge.pdf
    • https://rais.bg/uploads/file/zukigosovitobusivixupo.pdf
    • http://usateatop.com/_upload/files/bolibejibejizisosudovu.pdf
    • https://internationallanguagenavigators.com/media/fidejamenekakojaxi.pdf
    • http://vimbark.sk/editor_uploads/files/xokalurowolegikamuxiw.pdf
    • http://boschvietnam.com/files/usersfiles/files/wasotojaga.pdf
    • http://mid-europe-ex.com/images/blog/file/61071513442.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/jalemozexodoko.pdf
    • https://minhgianggroup.vn/upload/files/15128772282.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_off0000b83d.bin
3948742612159927805369d21d2acb27ba58dc94fc88eca993bf5be67fa028bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB83D 10776 bytes
font_01_sfnt_off0000d117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD117 16792 bytes
font_02_sfnt_off0000e929.bin
7732fabbbea7c7569c715c69ca6db754eafa303a0d6bc2db9f0f66df59cb5195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16032 bytes

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