Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bf22c5f7a0e5bc…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 18:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6faa8fe96868b42efd25de016d674887 SHA-1: 00c67a5a09fc6d503fb3a846771b14c83e0937dd SHA-256: 13bf22c5f7a0e5bc7024ef8c7a904c077a294a79c8d9a8805ac6fdee3e5e8aa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to what appears to be a link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://webaprint.be/img/file/rosodizu.pdf In PDF document text
    • http://le-nora.com/userfiles/file/juret.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dubuwudiva.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/daxoxananelaxibatememopi.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/35663966324.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/70714254555.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99b32ae80---1408172370.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/17196572833.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/mixuxof.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/josujiwoviruzigefojiso.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/wunedinude.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/nitimikixakebipuwa.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/27545828641.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9f252018---41623842484.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/94711903198.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/voduxitupezobusu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • http://generoussecurity.com/uploads/46883389230.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/50337959155.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/digid.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wogakovutilijuxifidoxito.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/sujuxelukegu.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/vepejidifakef.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091412224373499.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/27577763451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=handyspiele+kostenlos+androidPDF 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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C2 10584 bytes
SHA-256: 2ac475c15eb3ac30ba4e075a262be2c613bf636f70d8b3ab3cced54221fb1a6f
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 19588 bytes
SHA-256: d0ec6c256531db8d097ecbefefdd3e685c79d10c2480f1e34a5b080435b0de97