Malicious PDF — malware analysis report

Static analysis result for SHA-256 322d7c409726bc98…

MALICIOUS

PDF

115.3 KB Created: 2021-03-25 14:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 860bb88859fd9c6d59a44ff66bb16fef SHA-1: 219792287326c352e8b1d1713e3022901943eba1 SHA-256: 322d7c409726bc98336518923d6831b146e7f65735252b5c498e5d615caee8e2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to host many links on disposable domains. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

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://cdn-cms.f-static.net/uploads/4487413/normal_6023cb4a2ad93.pdf In PDF document text
    • http://service-hire.com/bawuginadumatirugiguvutuvti5lb.pdfIn PDF document text
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/wufaxurovuwef.pdfIn PDF document text
    • http://reabook.online/instructors_manual_to_accompany_fundamental_methods_of_mathematical_economicszmnxq.pdfIn PDF document text
    • http://shopyou.online/devi_bhagwat_puran_in_sanskrit_with_hindi_translationp3cb8.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/82260127172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_603b7eb081fb5.pdfIn PDF document text
    • http://form-copyrightservices.com/69162597427ozttx.pdfIn PDF document text
    • http://helpcopyright-service.com/rodiranov5r2n0.pdfIn PDF document text
    • https://bonomomu.weebly.com/uploads/1/3/0/7/130775928/9b78f23523c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379049/normal_5fc79087dcd1e.pdfIn PDF document text
    • http://philonio.online/10900121494ifhxb.pdfIn PDF document text
    • http://aycotoro5.xyz/imagenes_de_tabata_jalil_en_revistawzm26.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/basic_cantonese.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/dokolopepawe-jatutejori.pdfIn PDF document text
    • http://chambreapp.xyz/zimefusenebaxjzit.pdfIn PDF document text
    • http://portkamesto.site/php_curl_errorqkroi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=you%20hear%20la%20se%C3%B1ora%20ortiz%20ense%C3%B1a%20a%20los%20estudiantes.%20ella%20es...%20you%20write%20maestraPDF link annotation
    • https://s3.amazonaws.com/labitajaxatufib/guided_bus_tours_of_ireland_and_scotland.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/83628284048.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_off00018448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18448 5516 bytes
SHA-256: c847ad605e0e964baafc8ad5381db66dd4ad512fb8f249151b5afbc0be5869d5
font_01_sfnt_off000196b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B9 11524 bytes
SHA-256: 8ccad91fa77aff06cb6c371487817fedb0832b171afc48291309b4f1bac09fec

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