Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ec0f73101dcb58…

MALICIOUS

PDF

65.4 KB Created: 2021-03-18 03:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 62d50cbe10e285ab6c15d91ba721b07c SHA-1: a556f8d841f45786c604819505c794d746ff0d49 SHA-256: 24ec0f73101dcb58a2eb52c3d4d92fe6972c982bf0f8a46d8032876051bd3c4f
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=airmen+y+group+model+paper+pdf PDF link annotation
    • http://mivejuvididu.66ghz.com/sqlrpgle_free_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_60049fb312f8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5fc5b8a755892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5fd1f29a55df2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503035/normal_600482340b017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5ff9706507d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375522/normal_60027bf7bf376.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lekowezitodog.rf.gd/53425521374.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/97457683589.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/26238356760.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_5e03cce60ff04d9d8e03708907e11d1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/towixota.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/40623515848.pdfIn PDF document text
    • http://ribigilubawedom.rf.gd/panokam.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/xipisevuwilun.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_4357df9c9f354708b69c649d663975be.pdf?index=trueIn PDF document text
    • http://limixumijegaf.epizy.com/detevorowajuweligesow.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/lojudet.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_dd12087a57974c58a2bd6df89c584846.pdf?index=trueIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_10ddd54ee858450b9d8f92e0240bff22.pdf?index=trueIn PDF document text
    • http://welididoseburiv.epizy.com/who_do_intps_get_along_with.pdfIn PDF document text
    • http://sidalep.rf.gd/62575074768.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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 5272 bytes
SHA-256: 61c2883db06287cac2895881f295deeb408feac1d2987e1de63fc6191fbe258b
font_01_sfnt_off0000d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60B 10032 bytes
SHA-256: af4e3de6a43f8b73ce634e012601abdeae5ee65a62ab3fef71a05c0c19c36d6c

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