Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fa0ffe80576652…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 21:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cda0367e1b86e13fa726ce29f677bcaf SHA-1: ade5291d6da37603a5a747605aff3dc17e280bc0 SHA-256: 03fa0ffe8057665273e7e77cdb52ddcde4cb180cf84d7890f3ad95e7b7f4f64a
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external, untrusted resources.

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://e2ingenieros.com/ckfinder/userfiles/files/1694819368.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/60669901472.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614928af9360e---11112725154.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/21004499227.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/45561756381.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/zaginize.pdfIn PDF document text
    • https://22importexport.com/eimages/file/26662638687.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/tuwolarovifaxugepewun.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/17297666219.pdfIn PDF document text
    • https://kinohorror.com/upload/file/81031313918.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/vagubuzedoxub.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/ruzufo.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/21325132329.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kekebudowabifewal.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/fumiw.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/temabaler.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/wibopamule.pdfIn PDF document text
    • http://baoveantam.info/upload/files/38680189898.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zafasugomobowugesijuve.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/67422177176.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cb65ef49---95542341037.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/zezobozuvavisem.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/19679019581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bed+wars+unblockedPDF 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_off0000b5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 10644 bytes
SHA-256: 68c06fa66ce308f30e8e9dd0913a0610ca9f302c80e1622327ee3237bf607d77
font_01_sfnt_off0000ce6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 17500 bytes
SHA-256: 4e8aa5b122f551ae0b1de2b82215c9439861d726e8afaae4b90ed2cb2893202d

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