Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa164a17c2f122f0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 20:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53d281a5992d6244a32591e7c0614770 SHA-1: 2bef9e2e0f16df8f36ea683a4f562ba8fa840cca SHA-256: fa164a17c2f122f0048dd3eb644654e70bbd7485def942f7dbd79e8b529870d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The presence of external URIs and a link farm heuristic indicates the file's purpose is to redirect users to potentially harmful content.

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 http://cukrarska-vyroba.cz/UserFiles/File/maxupufowet.pdf In PDF document text
    • http://www.kingsmen-cmti.com/upload/files/71463510907.pdfIn PDF document text
    • https://mackbeks.com/files/file/43031235979.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/60822245829.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/rawirezitapini.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/zamonidam.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/folavo.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/24245742538.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/21947776665.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/xojitesumameb.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/piletufowuzuwusexavoze.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/ronuwefelidisajarotuke.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/lidije.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/68003465155.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137729117459---83392433758.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/70841002961.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/vuwulumepe.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/40288431891.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/pesofojolivimisup.pdfIn PDF document text
    • https://netlandschool.cl/files/78294845938.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/banenalixerufita.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/53618517747.pdfIn PDF document text
    • http://skncn.com/u/files/zubisijakobetafijuligob.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/47481473955.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/39267860674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=du+recorder+with+internal+audioPDF 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_off0000ce8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 20476 bytes
SHA-256: 495dd36ed5ccc93e7dceab1aec4f561955d99ebb584190ca15e30570ec3aef4b
font_02_sfnt_off00011bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB7 10488 bytes
SHA-256: a83f767042c93aa3c5bad197319ad4f2a40967d808020366d2f15f231b683fa4

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