Malicious PDF — malware analysis report

Static analysis result for SHA-256 955da8e6c6095b60…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 17:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a922faefa2eddfaa9b74033da14e033e SHA-1: ac3a754a324e83b9ab5399168d490d519c94f011 SHA-256: 955da8e6c6095b60d5a20bb3299a908e4e9c71145cd98e35ef2eebf460cc3927
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this document being used for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://murielbellhomes.com/userfiles/files/difipawanujifetoto.pdf In PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/da95204d0b734ee5e29abb4665fbdc29/dideserug.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/jorolopa.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ragasefunirumivodak.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/tibikadudobewemivosojar.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xuzexitixowasagonenigeg.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/28191050594.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bd5f23eb17c80c6102807156212ae034/nujirizavoredaregep.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/49496114351.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/56443337511.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tazojuwemebujinekiwoxujo.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/580726523.pdfIn PDF document text
    • http://ranch.pl/files/file/24935098979.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/83937903581.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-20/20210920055211143097.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/pipamuxitafaforepefabik.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/mazapenixobo.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/farazujebazufuxotibul.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/1939446819.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/rogilakuninomum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+quiet+place+part+two+release+datePDF 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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 10716 bytes
SHA-256: 74bbc8ddcfc7c1784da4da54997d7ce7351677c3e3e47afedbd31b3a5977d13f
font_01_sfnt_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 15508 bytes
SHA-256: 2fb54a9e6e579b21cd50ada9efed426d5db542569f3bc875c2252f224cd0a154

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