Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34e24c802dc4819…

MALICIOUS

PDF

50.5 KB Created: 2021-10-01 03:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 576d0032f1086a2e99ea7b76f8584735 SHA-1: 72a468cf0d61dea33999808ec9716ebe6b7ef6ee SHA-256: f34e24c802dc4819ed43427aa7a8b976086f6126498f0191971cd53df7b5bcb0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or malware distribution. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7385

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 https://krisoc.ru/uplcv?utm_term=what+do+i+do+if+i+forgot+my+lock+screen+password PDF link annotation
    • https://tidurmalam.com/contents/files/waforuj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n6nfc6qljuoektimlb3h0joo71/nuwadekomewenalanol.pdfIn PDF document text
    • https://maisonforville.be/documents/file/losirafepivuji.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/463982302.pdfIn PDF document text
    • https://toocapen.com/files/vekuraded.pdfIn PDF document text
    • https://netlandschool.cl/files/janubegenevobegiboje.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/55dae3d8684e1d9d04305dcf0eca25dd/fodilaxokunarim.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/nunejumefuma.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/15547874826.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/20680253448.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/52420510687.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/45118160385.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nujunebuwupigiga.pdfIn PDF document text
    • http://sissonne.hu/editor_up/wufonizowitiviwinovigofel.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/nuvozitaxepoxute.pdfIn PDF document text
    • http://vizcsap.hu/files/file/tadevuzujimekiwekab.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/11631139527.pdfIn PDF document text
    • http://mousike.it/img_ins/files/20717974705.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/16432371692.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/mitidav.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/denapagatofodut.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/26505244916.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B7 11352 bytes
SHA-256: a8eb607db7ca04dbd544bb07412d0b4c164931b4180f81e4239f22e098217f52

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