Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1c3ab8a825cadc…

MALICIOUS

PDF

66.4 KB Created: 2021-09-25 21:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f57cf6c01bae59426be700ec4d5bc277 SHA-1: fa12b28af4eeba674e5cb0cc95c8f05f52a4a4de SHA-256: bb1c3ab8a825cadc94e8e6425dea8030a9b021766e1c5e4014091d35cd7c979c
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 for 'Pdf.Phishing.Trojan'. The presence of numerous embedded links, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://huntic.ru/uplcv?utm_term=katmoviehd+it+movie PDF link annotation
    • http://igigeothermal.jp/userfiles/file/47355956435.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5db1ca9f07495c0d3d383dee2be3a8de/riteridagufaje.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/38949062025.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/mulosuvazes.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/vadawakoti.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/53780183904.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/gabojilirogate.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210921082420.pdfIn PDF document text
    • https://robodom.si/files_vsebine/60396561632.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/43060159475.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/tozamisarotogidug.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/77954930682.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/57812792783.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/5634883578.pdfIn PDF document text
    • http://tykhchem.com/upload/files/dulutavibarugejapupig.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/47796404352.pdfIn PDF document text
    • http://sentai.cc/data/file/20210913_045018_541.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/66777637076.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/45139112045.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/lolabolozudesavuwibepe.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/31993831271.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/larewokisipe.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://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_off0000ac0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC0E 10152 bytes
SHA-256: f3e94742ac846fcded5abdb7961f8aff612c340312e9e5a26968630b5cece010
font_01_sfnt_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 15580 bytes
SHA-256: 87209ff061a88f3547c27f2d2aad28cf4ae1ccda7c90f418c3d3ecf029687488
font_02_sfnt_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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