Malicious PDF — malware analysis report

Static analysis result for SHA-256 349d2d21c0a742f4…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 08:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61f1b17e141e33468d1e26c2b8553b77 SHA-1: e38974ed0eac2abb04faebc4b7bf4a679fbd366b SHA-256: 349d2d21c0a742f4751d9de9f98b95c3d901f6475af1742b776853ab2653faf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm strategy, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=code+beyblade+burst PDF link annotation
    • http://studiofagiani.eu/userfiles/files/64181243838.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/nudazemarenisekivekiw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/12226396735.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/jonupebukojosapuzimazuxe.pdfIn PDF document text
    • http://demkapi.com/resimler/files/vutitoniraviwulaju.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/15101505878.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034c61a1fb---85012200972.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/40811956090.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/zaxozapijuzimurox.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/jiminapeve.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/52135789505.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/wowidajawi.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kunaxo.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/15634146831.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/43477785358.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/33529322624.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/wavumemenufoxenorowode.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151841413721.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/tebirurudedudowutorekuje.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/totaxekowubuzu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/43986060730.pdfIn PDF document text
    • http://industra.sk/userfiles/file/36196244651.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/9545224408.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/83922436081.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/52e5d8315e2ceab9a28439ba1411026a/zumav.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_off0000c564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC564 21740 bytes
SHA-256: 9441ba723c1d7ac428b536ebe29c18246f094aa8f4575791eeb17c8c4a33695a
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 10432 bytes
SHA-256: 5d69b9ce5766f74919127bbc5d0bc2bba025e65548b6437a0ce6a66d305ae57c

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