Malicious PDF — malware analysis report

Static analysis result for SHA-256 938d3fb2f72d0780…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 23:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0dc385dc750fd282e5cd18ff6bb6f36 SHA-1: ebad44f1b29ffaed17776b4fabcd2afc32b60097 SHA-256: 938d3fb2f72d07802711603fd2ff6ae2841b3128715ce1f0af6037da8d4530b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external sites, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0bc907d4b---43201499876.pdf
    • http://millionsdiscount.com/mo_images/files/fotopunekudep.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mizufemuses.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/56929833721.pdf
    • http://yh-nutri.com/filespath/files/20210912081103.pdf
    • https://warungmimpishio2.com/contents/files/nejuna.pdf
    • http://hanart21.com/files/userfiles/file/82849057255.pdf
    • https://franchiseharbor.com/files/files/sekizivedi.pdf
    • http://dotacjedlaoze.pl/userfiles/file/31637996538.pdf
    • https://miet.hu/kepek/67176827056.pdf
    • https://kluchar.net/klucharnet/images/file/xavisi.pdf
    • http://giovanninociti.com/userfiles/files/zewolokol.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/luperuzejivipamenopage.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/xeburuzobubefawagivar.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/pimatiju.pdf
    • https://dogathermalhotel.com/resimler/files/kibededijorakuvisagag.pdf
    • https://network-italia.it/file/zefiranukajegokupalipurul.pdf
    • https://stormester.no/files/file/lekuxexir.pdf
    • http://dentherapia.hu/files/file/23707866127.pdf
    • https://sukienmiennam.com/userupload/files/gijedabowoxazagebuvat.pdf
    • http://edeins.com/userfiles/file/87044095398.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/fulekusurimawena.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/wukinozasejel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+shippuden+249
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d579.bin
e40b31ae89930d67e8271984599b3ef5d265db84441b973e96e24dc4603fafd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 10888 bytes
font_01_sfnt_off0000eeb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16792 bytes
font_02_sfnt_off000106ca.bin
5f1164da9070b980300433f74df1d3bf6ba9a68735d3e309fa29b93b0405ed61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 21328 bytes

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