Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dafb5f0f79a2199…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 19:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee3910388ff3d00f7583ade8cfeca6bf SHA-1: 0351dca4ac874b9ea1ba7f095320ff346e37e8a0 SHA-256: 8dafb5f0f79a2199bf1d9f92f120307c859423ed35cc0fe72df5e316c8eded7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=yoruba+film+download PDF link annotation
    • https://khanikango.in/file/batev.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/42227468096.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/milamowazugutigemu.pdfIn PDF document text
    • http://tradotel-riviera.com/file/fojepi.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tesoba.pdfIn PDF document text
    • http://holzbau-napetschnig.at/39954378134.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/zebubiminibibi.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/xowinifab.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/nasedefanasopipu.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/divutod.pdfIn PDF document text
    • http://8njl.com/userfiles/files/fizaxasufojotilid.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/zilesaparovopudojuxix.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/16599784011.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/mutigu.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/walaledodesexus.pdfIn PDF document text
    • https://wrd13.com/force/file/78481893355.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/78627545968.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/78351496567.pdfIn PDF document text
    • http://lulanjina.net/upload/files/puxisafu.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/63017554664.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nodejutoje.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/vijowubosid.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/94045976743.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28443279278.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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 10424 bytes
SHA-256: 6ca0f055257a70531014a13b09ab5c0c5134790e73c695a7875026e069499bd2
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 17580 bytes
SHA-256: 3d092e057a0b05c476330bfe59a0aa40adf3932cd7d1bc4270af7d13094502b8

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