Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fee4183a09e033…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 02:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bddf81fcf644c01114617a48691713f9 SHA-1: 9cdbda3122958298dcd2c736e115a98460d9f7a5 SHA-256: 08fee4183a09e03393adac294b0e69ef5560d5ec307194189a0a06fcebd31ddc
126 Risk Score

Malware Insights

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

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 suggests the document is designed as a link farm, pointing to numerous distinct hosts, likely to distribute phishing content or malware. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://saraya-shop.ru/upload/files/81184083280.pdf In PDF document text
    • http://meta-min.com/files/wulovifurugoboka.pdfIn PDF document text
    • https://beautydent.hu/editor_up/jupunepurelorun.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/21904815847.pdfIn PDF document text
    • https://banghenails.com/upload/file/21374923748.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/40893660335.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/87040057278.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143558a8049b---31248116479.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/84051431813.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/59325815273.pdfIn PDF document text
    • https://hoavily.com/uploads/files/82957240069.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/kagefisaxufed.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/9973374570.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/80703114346.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/475438965.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/nuzadepimoma.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/90904388851.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/sajivenuguruvumilijo.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/22983318364.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fubafefe.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/74720859304.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/mogagaku.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/duruwipurovinuseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=grindr+full+version+apkPDF 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 10688 bytes
SHA-256: 431e78c71f674839566d72af1cdc18dc3901a05ca722a92ba416a1ca8ee66f6a
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 17220 bytes
SHA-256: ed3395eeb8bccd19fd20f87c0c8fc13e25df44e3fe9d5da173b00fd456381cde

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