Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36e975cbe2ad38d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 01:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22f60a53c01aba922b9104e85b61f559 SHA-1: a7c35551bdd5e37ef7e89e87fd00330f1dd6e8e6 SHA-256: e36e975cbe2ad38d7a8d045029a8890dd50910134925a4caa6c770293517ba68
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are algorithmically generated and hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://catamma.ru/uplcv?utm_term=dead+target+2+hack+version PDF link annotation
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/dubusugemafisapaw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tonukolomupazo.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/11957578563.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/zafitigakile.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/83848061289.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/fizekodesijafewoxe.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/pafobuwiludibamote.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/64263787551.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/52907223142.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/11822925912.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/kanakepodujegimaxulod.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613772663d827---fabelaz.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/33161129725.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/45252298327.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/lelijomigop.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/31071427620.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d11d6d1b5---57546927904.pdfIn PDF document text
    • https://profm.hu/files/file/29363213692.pdfIn PDF document text
    • https://mediaskills.rs/files/53945034875.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210909230752155.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/sovata.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/dodemixamurasexetazigigi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4fe84341---45552269684.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixijikatoxuposudupotegos.pdfIn PDF document text
    • 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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 17280 bytes
SHA-256: 9f39bf321e7c7df59f8cfc18f497095e3d26d8072085424f3b5f2e89fd294008
font_01_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 10884 bytes
SHA-256: 33ca62af720a678330762ea1c55b21ba4ea3ca845e5230b752ddbbd60175a9d8

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