Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf7a6478a5a9f94…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 12:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38bf6f58aa9fb6f4aa71e0fc3b0cd956 SHA-1: cdd999951b7af5eb248a2f7e8f445d05d2a5932b SHA-256: 6bf7a6478a5a9f944687e5fb51d4a85300dd6d636c680e8c58ebc6f1e9830693
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=dead+effect+2+cheats+for+android PDF link annotation
    • http://mirutte.com/newsfiles/files/fasanolaridofenetekofo.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/61762785871.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/vuwawewusutitebexikitu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/12794316992.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/66737984881.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dadizotafogufuloriga.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/23727419054.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/sawuz.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/sorekekifu.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210910154929.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/46716565164.pdfIn PDF document text
    • http://nature-revive.org/files/file/koduguxikum.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109121454029811.pdfIn PDF document text
    • https://guijek.com/userfiles/file/44805881964.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/88773357373.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/jejij.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/xubolefedoper.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341ee4d8e6f---fesavive.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/58128544796.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/fevovewopupirepu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178b4481c4---fujogag.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210904_9EC03686E1B69DC9.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/78819233451.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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 10648 bytes
SHA-256: 5135975d9f193f1b3fdc08317fe29c54d8ed9512bc6965d6458c7c0d570fedaf
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 18788 bytes
SHA-256: 6bbd8361bd8fa05b4e9980d73f41493f7e5cd70ab535fb70c6e9600004843710

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