Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e9ce5f987ffef…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 17:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8543522fb4d8cf01c203ae30c7e5bcb SHA-1: 02bd6523a30b05a78aaeb37d987b093bd7121027 SHA-256: 8d3e9ce5f987ffef8c05659edcc27783b888c63dd5178423ff38b74529ce2c3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's intended to redirect users to malicious sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/luzuvolazulis.pdf
    • https://kurishupally.org/userfiles/file/40714702422.pdf
    • http://chanhbon.vn/media/ftp/file/30695161163.pdf
    • https://slicktechproducts.com/newerac2c/userfiles/file/86035461633.pdf
    • http://officinedesign.it/userfiles/files/29917148606.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/zudojilevutolowe.pdf
    • http://euromarkcreations.com/new/fck_img/file/57732935465.pdf
    • http://teormech.ru/teormech/usrimg/file/sugobexojobinuvapada.pdf
    • http://onlinetradeshow.ir/uploads/files/tonurotomujav.pdf
    • http://usateatop.com/_upload/files/tusidipa.pdf
    • https://parkettworld.com/upload/files/davozofuvidozipixi.pdf
    • http://v-lukomorie.com/uploader/files/71839861967.pdf
    • http://proxkimya.com/resimler/files/nogugodezumozir.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161388f890e9b2---45194035593.pdf
    • https://expomediainc.com/upload/file/gevevobofixavufukego.pdf
    • https://soechi.com/userfiles/file/9922912710.pdf
    • http://anthonyvienna.com/sites/default/files/file/16198359810.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04b7551a3---xefubanojit.pdf
    • http://another-partner.morefriendship.com/upload/files/gozawuwumezole.pdf
    • https://proia.bg/userfiles/file/22024354778.pdf
    • https://damiel.eu/userfiles/file/62884069264.pdf
    • http://queensparkview.com/image/upload/File/revesemixusepozavipujanu.pdf
    • https://hatinhjobs.com/upload/files/58101615286.pdf
    • http://qiangka.com/ckfinder/userfiles/files/35888831279.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+gentlemen+full+movie+123movies
    • 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_off0000afab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 16792 bytes
font_01_sfnt_off0000c7c2.bin
ca2c6ecf301b6cb80971437506a1937faae7451c71e6d26489941c4d2262df5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 10872 bytes
font_02_sfnt_off0000e0d3.bin
0eb24fa9210f9da3f0a5589cb131c75615bcaa93811ac0fa273ecec8cb8dab51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16384 bytes

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