Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9e2b5b04c36798…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 10:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b78f1d05153086ded52b0aba84b03d6c SHA-1: f96b3fa216c082c1d1be091b325893ec7117c5f2 SHA-256: 0a9e2b5b04c3679845965928ff9901ece6115c8f3a159dac6bab17f2bdd7e999
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to potentially disposable domains, suggesting a link farm designed to redirect users. The embedded URLs and the structure of the document point towards an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://organicearthfiji.com/documents/file/49203706145.pdf In PDF document text
    • http://lapawan15.com/shop/fck_file/file/duvunivekolebusoxezidobud.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b36bb14ad---notixi.pdfIn PDF document text
    • http://greenglobepms.com/uploads/tewogupu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-15/20210915205538634152.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/14783880056.pdfIn PDF document text
    • http://w-mill.jp/images/file/94174775777.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/26627912730.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/5945379635.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/3767565525.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/8149642144.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/39246605291.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/16557618978.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/ruvekalanamakepu.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/78182282461.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/vafafurinibuzudokasizu.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/84669362561.pdfIn PDF document text
    • http://sjhtractor.com/d/files/56300592536.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/kadelegimivi.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/viruduwaxilugu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/97190369836.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/70964368478.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/33950580280.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8phbclved2grvko6allfa2vb56/21178266143.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/16385345724.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/63183229426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=stark+vpn+telegramPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 10448 bytes
SHA-256: bdfd6492a984002b841248695fe1d396b202ed47181f68c95231096794488dd4
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 25788 bytes
SHA-256: 4f550b21fc38c372a976f6ea11bbbde1cb736545463b137d9a1243c669cd8a72
font_03_sfnt_off0001390e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1