Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95f1b491aeee532…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 00:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57d70060227213067283985c43f21004 SHA-1: 0cd303c6082c724e2806157125355f5aa4674b63 SHA-256: e95f1b491aeee532bd716d800ffa6f9d8552b3c567059270bbe61a7c276d623c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to various PDF files, many hosted on unknown or disposable domains, suggests a link farm designed to distribute potentially unwanted or malicious software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://bonezi.morefriendship.com/upload/files/33270351075.pdf
    • http://begemot-rus.com/uploadfiles/file/2021091105434973499.pdf
    • http://citra.cl/userfiles/file/rorexufusiwonipuda.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/28008540953.pdf
    • http://mintaialuminum.com/d/files/bonexikulukatazurunixom.pdf
    • http://www.pranabkumar.com/fckimages/file/39102828523.pdf
    • http://speckletrack.com/update/editor/file/33842139582.pdf
    • http://vibrator4you.cz/UserFiles/File/9925525921.pdf
    • http://dj-maily.com/uploads/pages/files/67706405746.pdf
    • http://hiro-seiko.com/upload/files/57570933459.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363748d8d28---27092557122.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/kuxumigomidojabixajezuzi.pdf
    • http://www.jobibon.com/admin/userfiles/file/fiteruvufodawirapag.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c82149a9b---22402438340.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210905115858.pdf
    • http://a1climbing.com/userfiles/files/17288054023.pdf
    • http://sxcec.org/userfiles/file/keledifudugadulinimud.pdf
    • http://www.web-globus.de/ckfinder/userfiles/files/47513290173.pdf
    • http://evo-models.com/uploads/userfiles/files/bonadibetikeg.pdf
    • http://chayka-svg.ru/files/90719245838.pdf
    • https://dialogueinpraxis.net/files/docs/bofagodutosijonavutakov.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/76396586667.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=vpn+master+lite+mod+apk
    • 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_off0000aea9.bin
6e5236f0b40e74dcdceb7d0e17dea79a7a8acfa9d90c34ab09269caf1a3677ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 10616 bytes
font_01_sfnt_off0000c6e4.bin
63c1759644d38ebd7045e5bff5be4825be6baa3b799b1653074c7b3983865620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 14876 bytes
font_02_sfnt_off0000ec46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 16792 bytes

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