Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ced9a058c206aae…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 07:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca0e9c4a7ab2dc8b4713ebb664776267 SHA-1: 1550fd0eaeaf3de08cd28883d2892e90b4795ba1 SHA-256: 3ced9a058c206aae26478ceec028c9a28fbcad7c4a54d3ffc33d1a27dd103c39
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 potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://desushibar.com/userfiles/file/vunivekivusago.pdf In PDF document text
    • https://jager-ig.tw/up_photo/file/98661677000.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lifisigavuzimilad.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/21197456491.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/37417976017.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/68815481013.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/mikozibevu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/594a84a3cd7634fbf6e5d97fc86ec3b2/93130217138.pdfIn PDF document text
    • https://cityface.cz/res/file/76757455967.pdfIn PDF document text
    • http://ndt-ultratech.com/files/gutatazesoleviti.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/kapopopuruzerej.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/puzepenolepe.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/55286709917.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/vezeporoginatifeg.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/selojixomunapitukafem.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pujexatowufinifonafutoli.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/livozilikotalerutanimip.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/72358900506.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/pabejagevirebur.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/wesipegewexijesivese.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/81710121766.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/3675900778.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/4335027771.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/wiwevog.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/ponafatuwaxebitedum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=call+of+duty+modern+warfare+2+download+apkPDF 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 10940 bytes
SHA-256: 6b809ce2150d89c46e4bf542abd7b4968473bbe7ecc1247d1ab535daf9d37d62
font_01_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 19248 bytes
SHA-256: efe1afafced1857e9466ffb59ffb1d563a58ef4fb25ef7329de82dfc549a64f1
font_02_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1