Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d26e70cb256bc24…

MALICIOUS

PDF

67.8 KB Created: 2021-02-24 23:33:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: db39748ca37a307a35d9cd5c7161b2ed SHA-1: aa8fd47c6dce491f0397fa89e2c44a84c3f72349 SHA-256: 0d26e70cb256bc24b09956d0138fffded9b6131583a0eb43a5070854540babed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=circuit+analysis+theory+and+practice+5th+edition+pdf PDF link annotation
    • http://vodabutopidaru.getenjoyment.net/cen-tech_battery_charger_manual.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/67329811784.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/gotuderawase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5fd9f8d70a4e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fcdfefbac181.pdfIn PDF document text
    • http://copyright-notice-ig.com/befaxupu4xzvm.pdfIn PDF document text
    • http://groby-ritual.online/26949658514s0iy1.pdfIn PDF document text
    • http://winfreeiphone.xyz/assent_and_consent_forms4fjto.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/19841444725.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/Mieruhg/regixubavufasizuzanisis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5ffb27f291f72.pdfIn PDF document text
    • http://swiss-gear.shop/lolesikewijegujipinulewi50sn5.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/cXb7dhd/29978167932.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/h5QEYze/rovivi.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/dhemBji/angular_melody_definition_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_6009f59f1fda1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/resumen_del_libro_el_caballero_de_la_armadura_oxidada_por_captulos.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/are_schwinn_spin_bikes_good.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 5376 bytes
SHA-256: aca296e3f2f7ddc277c7e106b0bb49bb8fc3ad5e34b601d79e3f3e2efc748c70
font_01_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 9548 bytes
SHA-256: d44a6d1d9259cc45425d29e6f26e01d65f3c3ec8ab1d09f484c41648032c5e92

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