Malicious PDF — malware analysis report

Static analysis result for SHA-256 710acbffd43f44f1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 08:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d6dc0298c00c84757f0e3d3b99e9e79a SHA-1: fae02ae59f86b7b03d4f562d47d96c6152972cf2 SHA-256: 710acbffd43f44f1a73f99f3edbe64a67fdd61a8efbc7e21e337a4eaf5b029ff
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous links to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and a low number of links per host, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4578

Heuristics 4

  • 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
  • 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://brickchamber.com/ckfinder/userfiles/files/lafujonebunapixe.pdf In PDF document text
    • http://abwrosedale.com/uploads/files/73955857582.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/13198988166.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/kozivevikogubilojipoti.pdfIn PDF document text
    • http://schokozentrale.de/idata/24109272628.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/luxomavajirime.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/pisumamajesazumepifelo.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/aeaf7f5a09cfcfaa7b317ea35e52f3ef.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/detesabolajiwuxovamumofag.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuzumenilunov.pdfIn PDF document text
    • https://resicolor.com/upload/files/lopegujigeluranomakufi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/ruwezo.pdfIn PDF document text
    • http://groupkaishan.com/d/files/58227934185.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/5086518479.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/54302497777.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/simiwajuvubeporakegubux.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/gutaxewid.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/46821741209.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/gowivupiraji.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/bafamanipuwikegevol.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/sozavafunibi.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/tavepofidipowe.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/84905843606.pdfIn PDF document text
    • http://ccshecea.org/upload/files/rolezuwutoxotivir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=who+made+android+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 17620 bytes
SHA-256: 3028f4124deed49ca2dce1fd4406531843ca963efe3af2ec14a85b3825340561

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