Malicious PDF — malware analysis report

Static analysis result for SHA-256 65dc594b0a76461f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 02:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81ee580a3997923b7ed5cc907e43449f SHA-1: 665640c8a02b105553a80e918710a68a4ca2014f SHA-256: 65dc594b0a76461fa781b65a7e5763e22d9d3bfabf64a6bdf493ce90e20b2987
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dtmaso.com/public_html/Imagens/file/77551739481.pdf In PDF document text
    • http://encino.ilovepokebar.com/uploads/files/lofiwusapegolofene.pdfIn PDF document text
    • http://mobiliteit.nu/files/bamufuxijazokeriwofa.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lumilopilad.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/mejufivuk.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090205494152936.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161405471bc8d6---tuxadelivebutefivoluv.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/95035976891.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ecc03df6---kaxaxokakituvazowabis.pdfIn PDF document text
    • http://julianina.dk/upload/file/tefowibagogowiwoku.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/sepixukokegemanonivijuta.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/lasubepukatugobigom.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/44573098069.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/22430296037.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/modobiponid.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/savado.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/dijoxigo.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/dawep.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zumudupotod.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/jetaxapixutajode.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/61285090501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+a+sentence+start+with+andPDF 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_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10420 bytes
SHA-256: d2557a7c4d355a2f524ed848086f00494ec2b6abe871ef36ac5f2ce7cc749c82
font_02_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 17592 bytes
SHA-256: 8b27abeb6c4251598649c3b577ad02fd8617df261482e6e8a0bbf7bb4771840f

Open this report in the interactive analyzer, or submit your own file for analysis.