Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a69a725e648c32…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc5711ae1b8bda7768e3e2944c66456b SHA-1: 070c599f6258907571f81696200c575de2ca3fbd SHA-256: 82a69a725e648c32c0a546176e6b95ea24590318af094db4e82fafef9249e530
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the idea of a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection suggest an attempt to direct users to malicious or deceptive content.

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://tavaszitura.eu/userfiles/files/suxewupiwuvituwo.pdf In PDF document text
    • http://daydreamspin.com/userfiles/file/ganipekaduwamodenafig.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/wivifegobelosavira.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/89525918334.pdfIn PDF document text
    • http://japhina.com/upload/file/87177300284.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/xejibivagarufugegura.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/najumoz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60fc8b74d---44888338133.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/51795011533.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/lanufarajeti.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/60113025758.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161327c000bb57---46049742954.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219111132573213.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/73965438740.pdfIn PDF document text
    • http://classtool.info/upload/files/45053847100.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/pusimugikufedajibimuto.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/zizumotajad.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/43986060730.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/64095363471.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/48284091000.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/60871604958.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/98970881622.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/papakoraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+hd+live+wallpaperPDF 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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 17308 bytes
SHA-256: 8bc2a57a70e8d21bbac493b58775c9c47538c15be44d1ace812d8e26cb18b975
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 10128 bytes
SHA-256: 3757fb578dbfa7f25c0c66709cde00759082391bc06aea9be0cf3b89dd4d796c

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