Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfabe169969b23c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 02:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63c11df1712f0fc5d37412ae7da9bef7 SHA-1: a2261fc06de9e6558ab0bf1e056c6660f87884a7 SHA-256: bbfabe169969b23c0549c97cf106c28462c6aac57ec4270c1655ebf0fd3e034d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for link farms. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions.

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 https://ski-valloire.com/ckfinder/userfiles/files/wexorefuwawileronutamogaf.pdf In PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/suxurivom.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/31273843793.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/31559258710.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/061458332369.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pejaxamefakuvaxofibetajad.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/88362480447.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/10974945662.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/xugoj.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/lebobiwakenabomesaze.pdfIn PDF document text
    • https://angkalaris.com/contents/files/89032905505.pdfIn PDF document text
    • http://amkchem.com/upload/files/35476342542.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210911044720.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bediwafejejaxotejagugi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d1ff2b63---tuxagu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd36bacb3---razaroladobekodoro.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210908010831.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xakufetejaloto.pdfIn PDF document text
    • http://vucert.vn/uploads/files/85526726102.pdfIn PDF document text
    • https://laser123.com/geektic/files/61007257107.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wabuxobut.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/75473945194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+playtime+1967+online+freePDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 18196 bytes
SHA-256: f231d29a8a1c60623cfc8c5171475d906856847d0c903cabdc0c531024d0e8f5
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 11120 bytes
SHA-256: 12e8e712149919a97fe796e458053e69e6c3cbb51ea6c23c45de2615dcfd338e
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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