Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcc586069cda5f3…

MALICIOUS

PDF

74.7 KB Created: 2021-06-06 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9e16f485fad8eec3ad9d76f05385c24d SHA-1: e814256524ea718cedae266c6c48ec127345bd19 SHA-256: 6dcc586069cda5f3eeac402825403485f7bd8f3ce83c1ecb869b87a24d3aa81e
186 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://catamma.ru/pbw?utm_term=problemas+razonados+de+6+grado+con+respuesta PDF link annotation
    • https://lojizeli.weebly.com/uploads/1/3/3/9/133997115/6913984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_600809c324133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487194/normal_5fe19efe85965.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/jikolud.pdfIn PDF document text
    • https://lobevebuwavija.weebly.com/uploads/1/3/4/3/134394718/jaxofasexikuduboxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424935/normal_5ffcbf51e4f06.pdfIn PDF document text
    • https://wenidudedovonoz.weebly.com/uploads/1/3/4/7/134721806/nazin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff9d692e99ed.pdfIn PDF document text
    • https://wopedibim.weebly.com/uploads/1/3/4/5/134585971/50bff1aaf2226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_605b404667805.pdfIn PDF document text
    • https://vowomupow.weebly.com/uploads/1/3/4/8/134846305/2110198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_5fdb1b6facaf6.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/faf116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_5fe6da8a0a066.pdfIn PDF document text
    • https://tusigidufamem.weebly.com/uploads/1/3/5/3/135350313/5541139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_60692f609b1f0.pdfIn PDF document text
    • https://mikovenib.weebly.com/uploads/1/3/0/8/130813447/depodetar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144685401/los_chamanes_de_mexico_vol_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3222251a-7559-4127-acc0-f621dfdfa350/data_manipulation_in_r_with_dplyr_datacamp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eec92a2-968f-4400-b6c1-5d109c70dec6/30946699935.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/37578537981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75da325-78c5-47e5-80e0-c631a88a3f7b/31837700176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d6232cb-7700-4a73-8c93-b93bfebb7621/john_taylor_gatto_seven_lesson_schoolteacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35f5372-c428-41ae-9dec-606430257b99/tigabovutebonuzunibi.pdfIn PDF document text
    • http://zokosixaged.pbworks.com/f/gigapolexekim.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144675768/12886609707.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 5740 bytes
SHA-256: e9f0ebe6fa48f279a8e401415f563390eda17e2d960ec43dd63a1f88b6b7ab2b
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 11596 bytes
SHA-256: 8ec51ea81e4152ab0facc33d51273049e0b17d2cf57bb86ffdc818f5e18a8b25

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