Malicious PDF — malware analysis report

Static analysis result for SHA-256 1317829541c4cd82…

MALICIOUS

PDF

93.2 KB Created: 2021-09-22 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf0780c7751513a5589515742cbf5921 SHA-1: abb20240b05abad207807ea18b494470f090f50d SHA-256: 1317829541c4cd820b8d7b1d452dfb7465b9015f7f7baf37f9ae97cd90975b3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. Heuristics indicate this is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent, likely involving the exploitation of PDF viewers or user interaction to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hnc2.com/userfiles/file/jugiromenuku.pdf In PDF document text
    • https://saatyapi.com/upload/ckfinder/files/61429964718.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/pojaf.pdfIn PDF document text
    • http://soles2walk.com/data/file/17041972367.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/15846092164.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/gavapo.pdfIn PDF document text
    • http://belovosushi.ru/files/56986819116.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/41030767937.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/xadopivazimepi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/57227182547.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/lunisakugi.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/folepaverijadafu.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/625842688.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/35789135632.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/mofefeze.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nijunexesagimefijozadag.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/95171364882.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/polizuxuwodafurajulebin.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/9111928196.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d7ee4565---72330487605.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/18291007829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fearless+daughters+of+the+bible+pdfPDF 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_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 18564 bytes
SHA-256: 3ebf70b139bf5c8d68a0898b1e2a96e6f779c3cb0cb154421d597495973b2fee
font_01_sfnt_off0001363c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 10892 bytes
SHA-256: 7f70d66ccca763baa958e21173ddd4847be028cbb832d875fcac62bb3e096131
font_02_sfnt_off00014f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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