Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad748fb9625c1e2f…

MALICIOUS

PDF

79.0 KB Created: 2021-10-04 12:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f5a18d8133f3f1714af9f6f8292ac65 SHA-1: 3c7ef4f5b24720af64b701a740b3a695dd56e919 SHA-256: ad748fb9625c1e2f3146fad62678db6fba773fe5b5a9c6cfcf7f433c2b0383c9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable hosting, and is identified as a link farm designed to trick users into downloading files. The presence of embedded URLs and the nature of the links suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=ssc+je+civil+engineering+notes+pdf PDF link annotation
    • http://copy-office.it/userfiles/file/86985635742.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/82570158468.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/vobitetuwumanadulapoxa.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/xutifa.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210905204250.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210927032614_j1k2sx.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/32435207678.pdfIn PDF document text
    • http://groupkaishan.com/d/files/72404612345.pdfIn PDF document text
    • http://modero.vn/upload/files/88634167670.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/61134380844.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/tukagifutemejowefarugiv.pdfIn PDF document text
    • http://dominant.name/userfiles/file/wiralofuzamerokasuje.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/povapifejalowed.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210910132146.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/xajifemovab.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/rudejixadezu.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/44397495678.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bitokotesizorafunamuwal.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8298e722d4a9e871d3adf3af76faf71d/37998306402.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lovixotepepomozivuzuveni.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/noxedenagasovadifizeditot.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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 18652 bytes
SHA-256: ff35b905f7325918c6c2c46624f3bc35e23db2b6e432b90143a9b85daa0a6740
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 10904 bytes
SHA-256: 85b6ea42d8d51ae774cc2d4b9b7d1e7027afdf7efd360a7af843c614c192693b

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