Malicious PDF — malware analysis report

Static analysis result for SHA-256 d12153b3936e0c2b…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 21:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0c07ceecfab488f8080e3d555932df7 SHA-1: 389c48f8f722fee60b3c8f876736a2b6dfc72cd3 SHA-256: d12153b3936e0c2b50cf42b8cb386e97c94d7308b9675c1f7e3413b8357068c7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating an attempt to redirect users to malicious websites. The high ML score and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://american-security-inc.com/assets/ckfinder/userfiles/files/54976413397.pdf
    • http://denis-lefebvre-services.com/fichiers/file/29074195819.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c869d458a527a887831c5ed826d7ee68/bukale.pdf
    • http://pluimveebeurs.com/userfiles/file/mimolozub.pdf
    • http://abovomedia.hu/_user/file/92822338951.pdf
    • http://clubesquilacoma.com/uploads/files/lobofenanu.pdf
    • http://healingtown.org/userData/board/file/doxozotumogikiw.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/gidijupusasolategakikesa.pdf
    • http://cyc.cz/pictures/clanky/files/57154091588.pdf
    • http://dade666.com/userfiles/202109file/2021091302234770554.pdf
    • http://microsolder.hu/userfiles/files/16792189655.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/pukepegusagaruve.pdf
    • http://mitcostruttori.it/userfiles/files/mumajasomomuwa.pdf
    • http://ssatripoli.org/userfiles/file/11867987937.pdf
    • https://hoavily.com/uploads/files/74630068696.pdf
    • http://citty.org/images/uploads/file/gitimebejoxixowokerif.pdf
    • https://tortugafilms.ca/adminfiles/file/12112283075.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/kafisagafake.pdf
    • http://mobiliteit.nu/files/reniwosotakizokuberowal.pdf
    • http://ventss.ru/userfiles/files/56901854308.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161426ff403b01---baxikut.pdf
    • http://autosoftware.company/autoresponders_images/files/gowunajop.pdf
    • http://tianlanlawyer.com/filespath/files/20210921081152.pdf
    • https://koratspring.com/upload/file/zugejo.pdf
    • http://co-mit.com/uploads/files/xegodu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+turn+off+voicemail
    • 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_off0000b3bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BF 16792 bytes
font_01_sfnt_off0000cbd6.bin
63c7e03bc0c379426f305f8e0212b7a29a16dc5dc088d11968d0cceb54ae6c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 10616 bytes
font_02_sfnt_off0000e41b.bin
7ddb188960a3071c8e3c9d566bc8c2c6e9e6fcbe8ee5ce0c895e4aa9bbe26f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 17508 bytes

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