Malicious PDF — malware analysis report

Static analysis result for SHA-256 acacd0f1b772f62b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 14:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76608c315381ed85082d8842b90ada60 SHA-1: dc5e12c2361e5a01f780a0fcfccc72d67dc231a3 SHA-256: acacd0f1b772f62bc79ce7a08ef8a54b55b8a9c962bd403b48277991e312a1b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of embedded URLs suggest a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=watch+demon+slayer+kissanime PDF link annotation
    • http://lightofislamonair.org/uploads/files/94614573798.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/15523919477.pdfIn PDF document text
    • https://medtek.vn/storage/file/naxefiwaxedel.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f521d243a68aa2b528d526c9c3b485ce/89894265279.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/11573712047.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613966cbc83b6---batipigawakig.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/31001404674.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/lufudetelafikevivul.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/62503682483.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/xezedodamuw.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/24528204273.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/gamibijosinolez.pdfIn PDF document text
    • https://tele-video.ru/upload/files/lomekeg.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/44437554514.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/83892898355.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/29181096999.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/someratuwofuxerowep.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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 17772 bytes
SHA-256: 251fe2a5f358a2f578857ddcaa53beb7ce0c0a54e92e6494b2bf5ad7f34e7efe
font_02_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 10836 bytes
SHA-256: 4601e2934c1d6e21dc5d9c10e4ad6d31a6c8bfd02cdf0ecc4def3e158e03c840

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