Malicious PDF — malware analysis report

Static analysis result for SHA-256 345e241ee5647424…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 02:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 194b9eeef497d06cda6caa8dc6b9631c SHA-1: 5af3d10d123ee6082de9f375554285a0fde51751 SHA-256: 345e241ee5647424d50b6b70998253cfe9832438db3e18c6a51755c011b6d831
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://crysiq.ru/uplcv?utm_term=android+x86+based+os+for+pcs+laptops
    • http://thietbiytedaibao.com/media/files/mebebokazevon.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137375f31c4f---16714854325.pdf
    • http://mikailang.com/userfiles/file/20210914130547_510418706.pdf
    • https://moulindelarroque.com/userfiles/file/morotavolulus.pdf
    • http://nickels.design/ckfinder/userfiles/files/tokaxusu.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/nozapinukapovafaluri.pdf
    • http://sgpeo.pl/users/file/dubefiwiwuna.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/51652462fc404b9e11a3c8dfe1dee07d/nemeroji.pdf
    • https://luckyfood.itweald.com/uploads/files/61419db21ef24.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/83864155975.pdf
    • http://oldstat.ww.tj/img/file/vapiko.pdf
    • http://kk-gorenjska.si/uporabnik/file/92636063208.pdf
    • https://smgbid.com/ckfinder_userfiles/files/6348865972.pdf
    • http://wadirumshootingstars.com/userfiles/file///67847718503.pdf
    • https://vildmarksjagt.dk/userfiles/file/74360479501.pdf
    • http://archetipoingegneria.it/userfiles/files/34476581488.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/60297541984.pdf
    • https://confetti-seasons.ru/upload/files/zatepepupuruk.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/bazazokavemoletalananitod.pdf
    • http://ilovechardonnayhills.com/userimages/sijazofaf.pdf
    • http://seksdagen.nl/userfiles/file/39161577404.pdf
    • http://angelascanu.it/uploads/file/17104894356.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://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_off0000b261.bin
c85a5094b32f5f1bf6b521847343e27591f7851c9e6008d2048d0a4528586d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB261 17668 bytes
font_01_sfnt_off0000e04d.bin
79bf3cb9b0cdc3c9cd81776a3fdda57164a97f3a5177964bc42a54b9d6112e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 11212 bytes
font_02_sfnt_off0000fa7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 16792 bytes

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