Malicious PDF — malware analysis report

Static analysis result for SHA-256 c303b6a83b7d0118…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 13:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b3a072c72f5e43296184ef41aee916c SHA-1: df5e2aecbb9fcd46780e5273b4863b922359da70 SHA-256: c303b6a83b7d01188de663fe1fb1203fd6c0d0159274152d30ff23117ba2710c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a pattern of link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://learningkey.org/userfiles/lonefevukigelezezodo.pdf In PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/noxikedasegipesawujo.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/89207141434.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/41553474045.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/kiponebudipunojuriwi.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/63573351040.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kirokezebusagilixebopax.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/96d867378925489a7b687bb6203365b9/2440417941.pdfIn PDF document text
    • https://egf.tw/test2/images/file/77200714626.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/51936860674.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kemekixuxokonufapujag.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/41731264596.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/44620250194.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/24693630653.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/78991935532.pdfIn PDF document text
    • https://tpk-m.ru/files/file/fitivefepopu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6ec0a390---88237124306.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/39383997096.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///fifisezop.pdfIn PDF document text
    • http://rsst77.ru/upload/files/nesigezuzolujawifiw.pdfIn PDF document text
    • http://w-mill.jp/images/file/logedakudeli.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/27363474591.pdfIn PDF document text
    • https://visualarchive.bg/files/50525580358.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210913041051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=english+dub+demon+slayerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 17460 bytes
SHA-256: a79c9d3d6fb5d625d419d664dc0a2582af39ba5d81798ab788f8d361bf3e2522
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 10936 bytes
SHA-256: fcf74b9d4a0b66b668d4457718ce26c15c56dc53cd59a2c9e052274841255c35

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