Malicious PDF — malware analysis report

Static analysis result for SHA-256 95739daf0c6be282…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 07:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5517b25510e82f8ccf6f0256543fdb7b SHA-1: 7c21922b4e0a4dfb683601be8ee101e4140668db SHA-256: 95739daf0c6be282d80f5a896c57efe30f92fe7e81147441dc68eec86dba45e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161369c77562d9---mujavijidexo.pdf In PDF document text
    • http://kaies.cn/upfiles/2109080428293776980m7rc5.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/fafunorizitag.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/90989011169.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/70663280828.pdfIn PDF document text
    • http://totoumi.jp/upload/file/wezagedasop.pdfIn PDF document text
    • http://feg.vn/uploads/files/41107120593.pdfIn PDF document text
    • https://tepihtrava.rs/files/75661868809.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/lamoxuzajox.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/noxasugolevebetotawefu.pdfIn PDF document text
    • http://uteambio.com/upload/files/pozutasipoleruzana.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/24976133506.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jobidu.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/tukororegozusarurifise.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/22779306098.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/ponomabanegamupoledodof.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/40960318868.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109151334534884.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/kelevuxo.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/ripovevusazofebovatove.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bedesuvabunibopaxiwuduta.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/vejufesajajamakijomofeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=yellow+and+orange+mixed+makes+what+colorPDF 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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 17952 bytes
SHA-256: e9e024434bd651fed7c34952e47aceca11bfef1959fe3473fca4a01925d85d79
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 11080 bytes
SHA-256: 026e3dd25028732b036ab85442e50b94afc8375dc57de9584f285bce769b58af

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