Malicious PDF — malware analysis report

Static analysis result for SHA-256 329d5d5fb65f31cb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 08:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb588c864b0c1164d67fee39fc2f110f SHA-1: 8ccee6033e9a7846794de4ce11d20d413be5fb48 SHA-256: 329d5d5fb65f31cb7ed2a43058484bd4e1dda3543c17046d2987ecba1367b1dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stockbauer.hu/uploads/file/tusabitu.pdf In PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vapuwasajimubabomos.pdfIn PDF document text
    • http://chinalabware.ru/d/files/82233787045.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/66830131138.pdfIn PDF document text
    • http://traviet36.com/upload/files/gipudusezupuwiwitalotap.pdfIn PDF document text
    • http://ctm.it/userfiles/file/9684128895.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/xedamamufumipazukegad.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/xovelodekala.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210915_020506.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/dirivaxoratabugoresakefa.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/puserawo.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/melizuxuli.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/33069539633.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/fugidivutu.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/jokimupaxezij.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/3507373617.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-3/20210903032241929186.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/30353009595.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/58008316482.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/25032298869.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd9768d9e---90044918260.pdfIn PDF document text
    • https://fuoriscena.eu/file/zetajivotuwawemoxadekuku.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/jolewa.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/mutipibaxenul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=criminal+justice+episode+7PDF 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_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 17800 bytes
SHA-256: 39202b3ff62c0ed454bafc9072d4ca68eed6ae0d63e4ad7227e822b97c1fde76
font_02_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 10984 bytes
SHA-256: 510e20abf4273c17ce06d3641f384b2d28c68c45c20a6deadb0f007222654566

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