Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c8cd4d119863e5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 14:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22940556cd639d5dfc86fbe6a713021b SHA-1: 97d5386262257e8e14039f7c0effa3c5be99c947 SHA-256: 49c8cd4d119863e519d235291534754174fe57fa9ab1d7430bdf7de4e5c12d67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=app+icon+not+updating+android PDF link annotation
    • https://simondaulte.com/ckfinder/userfiles/files/70391840001.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/14542119865.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/rotimopenesopawima.pdfIn PDF document text
    • http://zimmerei-possert.at/71103015079.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/bovojejizir.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/43063905282.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/20875550660.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/jumugofi.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/lotosena.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/92435301864.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://linhngapt.vn/upload/files/54445681019.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/57492597629.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/wuves.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zadazinudofazuwu.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/73346083888.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/xowasotu.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/3125994791.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/21198651758.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/tutitimifegevebudol.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb536db479---pureluwafesenusivuvotiw.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/meretoboderotexo.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/peripenekidomagaxiz.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/5294116713.pdfIn PDF document text
    • 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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 10424 bytes
SHA-256: 59d533b495a4537d99846932d9bbe5db959a8d8e862c4e7b4c3acd02021af09f
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 17776 bytes
SHA-256: 311fd6133a614248bb1683a9f6d717d0af45a535cda5c0f44b7fbd0249d8fffc
font_02_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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