Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c32c6b47efb8a7…

MALICIOUS

PDF

72.4 KB Created: 2021-10-12 22:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f4beef7bc6a624385e1b6b67d382627 SHA-1: 11f341d2359e6ef4cef7e3995486cce1c47e9fad SHA-256: 43c32c6b47efb8a7896f83e731e937601ceef272a7778862ad783a9f97149a2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://abyss.sk/userfiles/file/97412540132.pdf In PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/13846517668.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/volaginitil.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/jakawugefuken.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/32036875520.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/70417230221.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1632783402.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/37975659503.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/05dbf24a824133f1243cb88e801deb3c/18750338083.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/taxuwepikisananesut.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/ninedubarikomisogufaparu.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/71591270047.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/buzubudimujixutipawij.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/zurepijitukiserafes.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091406123687.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/93044700742.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/zulapenawitekufiworebu.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85386173172.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/56185030367.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613029e310165---73485078979.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/48221767075.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/zeguw.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/70391228868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RC0zOYPQW8A/uplcv?utm_term=photo+edit+face+to+another+body+onlinePDF 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_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 16456 bytes
SHA-256: 9668bd313b085c6885dcecb9cbe61b95b42ec66e31df33beaee1594a8bd481eb
font_02_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 10660 bytes
SHA-256: c7d590b843041aa90bb246f5c28a5626565f71cf51727279423403931e4b7dce