Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fa0cecd61fe98e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 22:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03c3e61ba696eaadb331c8be83e2b303 SHA-1: c09cce88d2ebfadfc86c08b08ac0caae6b9eb04c SHA-256: f9fa0cecd61fe98e920df843f161c43f7a355227fcb3b3eb0d0865db80fa612b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to external sites, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://damosushipleasanthill.com/uploads/files/tukoninowagipizu.pdf In PDF document text
    • https://okinawa4d.com/contents/files/wolakibiz.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/worezukeziwa.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/37751543532.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/39137989120.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/51847989113.pdfIn PDF document text
    • https://pellevah.com/upload/files/gagajom.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/vulupowefazuno.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/23249551457.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613837db11508---pefabubobopurixapizireb.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/84353394990.pdfIn PDF document text
    • http://getdol.com/page_data/file/litifiwixomiwaninal.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pivimemut.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/32757654620.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/jifoxijanugepura.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/tasasezuzumedeze.pdfIn PDF document text
    • http://entrackintl.com/uploads/7749382634.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dl61i55i5a3mfismmvuio6rbsr/46005696279.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/bajegijabufuwo.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/14341895253.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/52949050968.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/96592587811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sniper+3d+pvp+arena+hackPDF 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_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 10584 bytes
SHA-256: 3de2cd54f783478e5c972a6ef0ee79d2ad5931b2c86a93fa8a13c1ee6b241b55
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 19000 bytes
SHA-256: 189b3f21d209b0eb6f6cb676c632a885c5a7c3b1aca1f816746cae2d3ee1908f

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