Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd37ea8a821ad551…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 19:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df78186be7790514c03c588b049923d9 SHA-1: 3726d0a07393c7c567cde9a5fa25d24514e97126 SHA-256: cd37ea8a821ad551f5fd437a7e4a684ebb50d506f8098d0492930b3a9298511b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pphjako.pl/userfiles/file/70718927302.pdf In PDF document text
    • https://hoangphatdanang.com/uploads/image/files/kadabuxadatox.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/93549474229.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/77460826236.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dovabalomepugologoger.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/fadojida.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pugiwemaganetigazagosuj.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/2324983444.pdfIn PDF document text
    • http://vhktn.at/images/content/files/xilitunabipozimegodazugi.pdfIn PDF document text
    • http://dfanchem.com/upload/files/98652677772.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/tupetudopekaseba.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210910012535_794671708.pdfIn PDF document text
    • http://agama-rc.com/upload/files/gumefofadovuzitiruwezeno.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210918_092640_7940.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/81434933985.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/72247461165.pdfIn PDF document text
    • http://computerdoki.hu/user/file/17036025816.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/vidiputupuzowasew.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/94648906536.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/75580731129.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/gobefiparomazixulifedeg.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/vegipudomike.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/butuxufesinobom.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/gukotuzijarikolaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=define+unit+elastic+in+economicsPDF 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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 19784 bytes
SHA-256: eba82cbf886dafa7c5cff2ff67873d1997b230ef4473d19240eb7ed2ce61cb99
font_02_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 10496 bytes
SHA-256: 593fa4d2e0df8a21f44a4f25cec42ea666a459fc5025ed42aedd866eadb2e164