Malicious PDF — malware analysis report

Static analysis result for SHA-256 41923b63bd182034…

MALICIOUS

PDF

96.7 KB Created: 2021-03-13 16:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 03579313c3e3c1145f62b87ebe41b153 SHA-1: 9bef7cf168184bece82a1037c1d36bf513c19c72 SHA-256: 41923b63bd18203477e7ba39b2780d9cc5ac57bf85b24b1faee337941dccd527
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links designed to appear as search results, likely to lead users to malicious content or phishing sites. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=nicomachean+ethics+sachs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367300/normal_60138f5976eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_600b661d4ba2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fe16c9061dce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366408/normal_6001716d88646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_60493f5fbe8c7.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/7784557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5fdecaa610da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_60393c721c59a.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/7605391.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/podinubixikipos-galotelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_6042d4e9d7a2c.pdfIn PDF document text
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/3499676.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/5972519.pdfIn PDF document text
    • https://dilimeriju.weebly.com/uploads/1/3/5/3/135351787/8177799.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/gofoxaxesi.pdfIn PDF document text
    • https://woxonixifataki.weebly.com/uploads/1/3/5/2/135299653/dewudorabemigave.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/votubukaxogilix/fapunomabugusud.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/87596441591.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/suxokirapanipuveto.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/sepotopuxa.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_off00013f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F13 5236 bytes
SHA-256: 9923b2d4064f44fab22393d68907492cc26cc34e36a4a85fc4ec5333dedbfcd9
font_01_sfnt_off000150c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C6 10808 bytes
SHA-256: 02dfa5c0d97950ccc06e1e9ea106a4cda6a66cc8f22759984b46652ee02853bd

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