Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb70636e9d4f28c…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 05:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 539be289c031b1c9ed91f08a0b7c3d66 SHA-1: 7bb44ba03c354e99d136c12f338839d76fa7180d SHA-256: 8fb70636e9d4f28c331212606b18fa1b0a4e9e8072607993030ad334ad2657ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The PDF structure and embedded URLs are consistent with spearphishing attachments used to redirect users to malicious sites.

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://wastran.ru/uplcv?utm_term=jetaudio+player+pro+apk PDF link annotation
    • https://vhcvietnam.vn/ckeditor/images/files/kakadereg.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vumaxeguponobu.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/85378825192.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/zumule.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/renonadugebotep.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/22325911465.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/savegudepopubusomawazu.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/67083258579.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/jowewonetosipirajevil.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613d58f77db3c---45455491725.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_070907.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/57631520590.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/92965477010.pdfIn PDF document text
    • http://odumakus.com/uploads/files/7204627441.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/mofaf.pdfIn PDF document text
    • http://islandpointfl.com/userimages/fesoxewizogolajabirapim.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135887e294a1---93704995597.pdfIn PDF document text
    • https://cooperspick.com/files/23586547206.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/53744051176.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/dufafovurolovabepajokuz.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/79885057923.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/28935731563.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xagix.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/43445429794.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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 10408 bytes
SHA-256: 43bd5914d35b431ab0546115b67959455f04a13c5727aada2f489f8ce0b0917e
font_01_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 19104 bytes
SHA-256: e11b33c9b28423f85c64e2971a149cd0b7d0a80e857cfec53bdc872f541c6125

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