Malicious PDF — malware analysis report

Static analysis result for SHA-256 05366c5a17d9f30a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 17:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c89b310054837c80e7f8794d5ecbddf SHA-1: ffd31b061e162cd6f21a800757c814fbfbcca1ec SHA-256: 05366c5a17d9f30a8da5c915204989955e9adef5c5374c06f95da19165cd52cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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://huntic.ru/uplcv?utm_term=live+transcribe+android PDF link annotation
    • http://hcbarrett.com/user_area/file/39924996506.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2757026875.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210910013817.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/70879726478.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nowudiga.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/7540547292.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/82153587930.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///76451448324.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/duwotosumumoletojux.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nugikiruvoxe.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/xomewaron.pdfIn PDF document text
    • http://www.bash.cl/media/file/86178327647.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/62438349460.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c4a3f33fe---sujevusane.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/76150653598.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016050641.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/kizisis.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/melaxukajumamumeroluzera.pdfIn PDF document text
    • http://netart.hu/userfiles/file/fipofedegilagi.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/49895998175.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/jawuxepojakefedurul.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/momovemijewijufeso.pdfIn PDF document text
    • http://air-ned.com/uploads/files/28098642377.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/vipulewosasofezin.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210905000122.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 17620 bytes
SHA-256: 85ef53f597fce098623e21e7e57210bc2299314731d30d13199e837e575539dc
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 10480 bytes
SHA-256: a5e18a71857a06140b758b59d47acd8e29bbad468f486e3f5ebe6a750a92c9ec
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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