Malicious PDF — malware analysis report

Static analysis result for SHA-256 d618b6b3bf23187b…

MALICIOUS

PDF

79.5 KB Created: 2021-10-05 05:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3beb2278f6ea813aac35ad18b9e049b5 SHA-1: e36b263b9dcf6e755164a4363918460879ee669a SHA-256: d618b6b3bf23187b66438d8241f5ea140bb90286992339c057b13d6bd4b0fdd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it functions as a link farm or a distribution point for further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags it as a link farm on disposable hosting, reinforcing its role in directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://12waktu.com/contents/files/xuboraferi.pdf
    • http://indecomavo.pl/userimg/inc/zugusafogagaxetoku.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/bamoliwotor.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/78665470490.pdf
    • http://gaudi.tw/upload/files/20833572462.pdf
    • http://rudolphi.nu/userfiles/file/kemona.pdf
    • http://artdealer.vn/upload/fckimagesfile/e78d9b1792a5d17d744e8a6827af8f14.pdf
    • https://suthuytinh.com/app/webroot/uploads/files/22616819644.pdf
    • http://netichikawaya.com/userfiles/file/73714730109.pdf
    • http://villacappuccina.com/userfiles/files/84579893207.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/m4hha05e6k559elio4ost2k2or/31852349113.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/butujizo.pdf
    • http://tantusmarina.com/UserFiles/file/dukunosadifoka.pdf
    • http://vendsol.com/userfiles/file/wefapaganipajak.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/5666205267.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/gajif.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/94193278384.pdf
    • https://stdtekstil.com/upload/ckfinder/files/lewulolisipazopaj.pdf
    • https://thietkeweblongan.com/upload/files/92523107339.pdf
    • http://ecme.site/2015/vat/upload/files/temarexemusipumosuna.pdf
    • https://oancora.com/ckfinder/files/38160291350.pdf
    • http://stopguepes72.fr/userfiles/file/10882319938.pdf
    • https://picinterior.com/ckfinder/userfiles/files/getasokutinosofobeme.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=local+government+act
    • 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_off0000d362.bin
e8f19be560a4b57379c07095f3daa12c81716946009f1ffe8e761677c1d52ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 17704 bytes
font_01_sfnt_off000100fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
font_02_sfnt_off00011912.bin
b240d3a7abbdc05e45c8a6af3e293e2121f46fb50efd4d8c06d7117f21d37f98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 10336 bytes

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