Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9e260bdd3bb5ff…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 21:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a6c96f1f1918735354f4594bd3a6ae7 SHA-1: 945db0ac7a4630c9d74b73920068ab46467c1637 SHA-256: 8c9e260bdd3bb5ffe4b75b550c749311510c68b560841689f3c693a81e1604c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct, potentially disposable hosts. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://banner-ever.com/ckImg/files/72673532616.pdf In PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/rowibonutomexetenokuz.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dupotolidoxevazono.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/91910070550.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/jujafo.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/18047253901.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/75984974766.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/kekigozigejakit.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/68021761972.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/watukun.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/dunozevelo.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/xalijamojil.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/bazilesep.pdfIn PDF document text
    • http://falconltd.pl/cache/file/gosetepetosowif.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/getebotil.pdfIn PDF document text
    • https://ms02bet.net/contents/files/96635731141.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/lesin.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15243784290.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/sovometudomafufonunosete.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/46907758093.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/63384620034.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/50930919798.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210913_023120.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/junokiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=subway+surfers+for+pc+offline+installerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 18488 bytes
SHA-256: 33b33ae58d3df095544b3e2816e1b5f9e815466dfa8c10e63066d52d0da6ca5d
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 10988 bytes
SHA-256: 567f6757a9044b1150058db39ed703bfb1a4afd125ba960f7b61eac70228740f