Malicious PDF — malware analysis report

Static analysis result for SHA-256 65213ad340817de4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 19:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56ba18ea689ac22e0a025ff2a4ff8c3f SHA-1: d2d6d2beb0bd638178a42b29b98dce2da922bea7 SHA-256: 65213ad340817de4b64e4a98883d5986d953a30a03e3eec8060fd71a54366f3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=tactics+time+1001+chess+tactics+pdf PDF link annotation
    • http://bancasemecanino.com/userfiles/files/74214241294.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/43693523020.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/91118227095.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lufuziropebawojijoz.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/89677288393.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/nugade.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130994bdfb59---volituko.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138320f819dd---73448259037.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/wugukobuvajugotedatikef.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/23041614350.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kamilibib.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/xisakumakokinupezewojawa.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/5876876258.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/vewovalexivediru.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/24916996281.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/69157634353.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/bovegaxow.pdfIn PDF document text
    • http://apart1day.ru/file/73380916479.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/nadodelasufujagerusikulex.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/43377744801.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/58795249028.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/87390860636.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/wipidadijiziz.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/41321219807.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/39691618205.pdfIn PDF document text
    • 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_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 10652 bytes
SHA-256: ed4d84d85ef8b0e44afaba571ac30175d8f0b0b9ee4cbbc4a39529d907983e87
font_01_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 17748 bytes
SHA-256: 10700d6e15f2d0c34d31a196f7c605addc4cad641c2d1bc6482756ce062028f7
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1