Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c78930f9adcf250…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 10:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38731e96e54e23cd7f99fe9846f9964f SHA-1: 0c62c2a308d1255d63501c18bc9395ae581ee4d5 SHA-256: 1c78930f9adcf250d5bf05172a23b31ed572ac8190b3a2fbb4093de44ac96594
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://paymentor.nl/uploads/file/2494785748.pdf In PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/rewat.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/29922960211.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/67975280061.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/dabane.pdfIn PDF document text
    • http://gomail.vazoom.com/pictures/55514712311.pdfIn PDF document text
    • http://haai.org/upload/file/76366273113.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/69142194694.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/gizafimebebewid.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/10751802782.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/27856842784.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/19023598828.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/11724926836.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pivisez.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e18026b45eed828e2c1272e84813b1c9/61183400037.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/luxujonavevedabafef.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/90306702336.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/6886833215.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/fujoweromozatuvajapej.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1693645911.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/74361479826.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161538a09cf9e8---kuzulodudemep.pdfIn PDF document text
    • https://soechi.id/userfiles/file/25315778500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=metronidazole+and+amoxicillin+together+for+tooth+infectionPDF 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_off0000aea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA1 10908 bytes
SHA-256: b0b94eec9f897e81ce8888889c1bc2739568f96f1854a2b21edfa6f95dfe59e0
font_01_sfnt_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 15088 bytes
SHA-256: 232d124098b5869e468aa13341eed617729ac7589cdcee443f02695ac4ec9b66
font_02_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1