Malicious PDF — malware analysis report

Static analysis result for SHA-256 84004fcdc75451bb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 05:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 21b0165e796f7f7eed9f329e276905b2 SHA-1: 6ea484933eff98f6633469cb037a376ecf9dcb7e SHA-256: 84004fcdc75451bbc8492b3d26bbcad54cd4c53bfa73a28febc4c351d4e59331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://boatmonies.com/uploads/files/bedizasosa.pdf In PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/nuteretoxoputatemavufe.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090719172095.pdfIn PDF document text
    • https://stormester.no/files/file/vobiwegezijes.pdfIn PDF document text
    • https://webhosting4.net/media/file/tubasufuwadaxigatatawon.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/nunolu.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210901130644.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/wolirer.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/razazuku.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/adb1a600b4d47732c3650d3c4220a973/72695191831.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/82299614972.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/85536953929.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/99994829095.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902081226_1634030887.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/vajipaj.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/zavovevixadujeta.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/sotawolifivu.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/45363287007.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/dabofumesorop.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130123643bc7---linivunufatifaxoletoru.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/topopulibo.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/getizupaninela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=league+of+legends+dynamic+wallpaperPDF 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_off0000b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94B 17392 bytes
SHA-256: f7e0676b306d88a30323935ad8bd17f5e84ced9bf1b2c42737ee07dc8402269c
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 11124 bytes
SHA-256: 33bf64968f565a0c224d3492343a11806fe59a37028e289d5c763060a9bd393e

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