Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea0f7c6edeb8f75…

MALICIOUS

PDF

68.3 KB Created: 2021-02-28 22:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cf0a367df981dff4d4a4634a4005fbe1 SHA-1: 0c63c4d7f06966f87ae500b163123ca788e792ed SHA-256: fea0f7c6edeb8f75ad366d2e2c01e88ea238cb0edf1e9c74d526e6cf9ee59537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to disposable hosting, suggesting an attempt to obscure the true malicious destination. The embedded URLs are likely used to redirect the user to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://vilenefex.ru/123?utm_term=sue%25C3%25B1o+de+una+noche+de+verano+silvio+acordes PDF link annotation
    • http://timinome.getenjoyment.net/new_york_state_map_usa.pdfIn PDF document text
    • http://detonicufficiale.website/short_life_quotes_in_spanish221xb.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/wujegutugitiganedojidixi.pdfIn PDF document text
    • http://detonic-italy.website/diary_of_a_wimpy_kid_rodrick_rules_movie_downloadxszbg.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/gupurovazoge.pdfIn PDF document text
    • http://e-devletodeme.net/75267654135311zf.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/36244145737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xupikilagi.rf.gd/sitosatupupixuwisumova.pdfIn PDF document text
    • http://nununad.myartsonline.com/modos_de_produccion_esclavismo_feudalismo_capitalismo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 5204 bytes
SHA-256: 7302992bd9198c63578f9ca784ef76f448eddc97488c4819d858a2cbcebc9a70
font_01_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 11700 bytes
SHA-256: 434bb071ba0272e058e0250316acb7ef890ba441d26929729bd6d03350bfc682
font_02_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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