Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd5f67810ee1526…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 12:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9e461933a00cb4e02e48e71cdc0f75d SHA-1: 367400d85e27dc390250516bdb967d1e8dd6c2f9 SHA-256: 8bd5f67810ee1526818d01ad43f2055cac3edef5b3737bf0a41a380dc829fb12
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ecvbrass.ch/user/web/file/zanuxelafilet.pdf
    • http://yingtailong.com/upload/file/210901112539147694dm27esjs0r7f.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/378aa300d2917978ed28d724c2f30d9b/57581032825.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143e84625917---82795546771.pdf
    • http://musicpark-live.de/userfiles/file/zutobulawovogopigus.pdf
    • http://chinastom.ru/userfiles/file/pegugidakinojifarobafim.pdf
    • https://khmernative-rice.com/userfiles/file/fesataruv.pdf
    • https://hoangvan.vn/wp-content/uploads/files/87204314217.pdf
    • https://oncetrabzon.com/resimler/files/zuvewudujeferuxadozuw.pdf
    • https://bmw-zona.ru/uploads/file/1141834962.pdf
    • https://glamweddingdesign.com/userfiles/file/wululilivoju.pdf
    • https://peterdegendt.be/file/wusudofoforovekegutofim.pdf
    • https://commonwealthsportsawards.com/userfiles/file/14928149618.pdf
    • http://perfect-gallery.com/userfiles/file/wubebavuk.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/49100973861.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109101149215136.pdf
    • http://gianniarnaudo.com/userfiles/files/ninijufap.pdf
    • http://mrs724.ir/basefile/drtiketcom/files/toxavu.pdf
    • http://gokea.org/upload/editor/files/12795470477.pdf
    • https://cape-electronics.com/media/file/48271647622.pdf
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904013758.pdf
    • http://dunajecbiala.pl/upload/File/vazokebefob.pdf
    • https://sofupingame.net/calisma2/files/uploads/81050643218.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/74887437697.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=suicide+squad+free+online+movie
    • 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_off0000dfd6.bin
b4ab7bd4b7169f044947731b435537efe8bb61c8004ebbb92ee31bff900028a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10928 bytes
font_01_sfnt_off0000f8e4.bin
88696af49d3e3984b879508af6b8a4631be6bfa08caed7dee2866a0071bc7780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 18968 bytes
font_02_sfnt_off000129a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes

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