Malicious PDF — malware analysis report

Static analysis result for SHA-256 47c0fa45f016afd3…

MALICIOUS

PDF

96.8 KB Created: 2021-09-15 11:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d48dd8f53d25e4f144ae5baf7a50541 SHA-1: 3e511930ac3c9cf54c918352a1f75ac8d974c60c SHA-256: 47c0fa45f016afd3e089966a3db93ae73cbdb7cfa40731ed521dceb888174519
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding numerous URLs pointing to potentially malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign. No scripts were extracted, but the document structure itself is designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=the+wastelands+pdf PDF link annotation
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89c2c3ff---jopeladadegukes.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/litalofukupafukeparamiwux.pdfIn PDF document text
    • https://hinaweb.com/upload/file/16984095285.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/23626730329.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/sidefuwofuvujojarus.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/69641977124.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/16961993692.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161343ce4d4e5b---48791983600.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bunefososurodu.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kazujisonivo.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/zurupetizetixakifed.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/nasovinogotufizulotixewa.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/luwubawovi.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/16344393568.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/ravulipafox.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/tafavuled.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/32178532194.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/6425699929.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109131742264741.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gatitojutisunaxokugu.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/sinavupufofadu.pdfIn PDF document text
    • 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_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 10332 bytes
SHA-256: 62b470bf6a1cbf2873144f1f00fc67aa2ca1fdb3b099a6ae1afdd17736bb7fa5
font_02_sfnt_off0001424b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 19640 bytes
SHA-256: 7bf192d0f2452338ccfe3a03b63bc8f72bfa9eec14d32005dfa54c9944de7b22

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