Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf02b1092b74d684…

MALICIOUS

PDF

72.0 KB Created: 2021-09-11 06:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a193b9ff901acd8f5a9be72c20560165 SHA-1: 202dda7cbefc0ca85c2beabe5ae66be1c43a0995 SHA-256: cf02b1092b74d684ed3f5a3faa9aec503172a3ba7ab96ce23285a15526b15341
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lionsmarsala.it/userfiles/files/84033145743.pdf In PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/36165988452.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kefetivujitufijofimugugid.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/wuxesizovudatev.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/sugibiripojuxi.pdfIn PDF document text
    • http://kustari.net/userfiles/file/90111288062.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/12767311812.pdfIn PDF document text
    • https://khanikango.in/file/jojinapit.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/sopusap.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/11461145051.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/sawojigoj.pdfIn PDF document text
    • http://kammed.com/userfiles/file/sawasibazomos.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/15476970130.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/lenigulafoji.pdfIn PDF document text
    • https://purefeeling8.com/data/file/26943780108.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/wobasexuzofanutanepatol.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fupase.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gijeraguto.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///sopevesofumekilatunewoki.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/77515484901.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/88700778031.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ueeq96h5n44aldqqsfcg8qu726/fomat.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/4403431436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=alien+shooter+cheatsPDF 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_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 10308 bytes
SHA-256: ad6b472ddcb7ef60547227a3f480588c3b0188a22e03089c2abba27b159e29c0
font_01_sfnt_off0000ccdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 17856 bytes
SHA-256: 641f35cb1ba50a8463bc6a6d3dd0e1e1928f2bc99d0e8fe181d6a491841c4751

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