Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f04c7d9f277c27…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 16:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 650abbf3c77e6f0c765474634e5e2a0d SHA-1: db9880536371196ddab3d6b60a0e36a50e5a21ae SHA-256: d8f04c7d9f277c27bb0ed9187cc5c98c84353fa0ee0100e2f91581ea5db45502
154 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to potentially malicious PDF files, disguised as software downloads. The PDF is malformed with an exploit stream, indicating an attempt to exploit vulnerabilities or deliver a payload. The presence of urgency lures further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://uekekb.ru/!upload/files/duxiradonafujokige.pdf In PDF document text
    • https://saikekanglun.com/filespath/files/20210914135546.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/17570413075.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/vofusubuzudokuzizawogi.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/fesifubajovare.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d0b163fed45643632ecb1b81fccca67/rirasu.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/savim.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/dokesafalov.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/29832511803.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/kegixefu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/tekutipibelowem.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/timomexovajewokuliseko.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/37388110803.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruvozudataxe.pdfIn PDF document text
    • http://metapolar.hu/tmp/26694474024.pdfIn PDF document text
    • http://vinmexindia.com/uploads/rifozewapemusunetizijod.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/zelatamowarif.pdfIn PDF document text
    • http://muszempilla.com/files/file/limepobisezumeped.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/21936962590.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/19789605962.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fokerizezej.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/57375739905.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/sidafujobapugavofafubor.pdfIn PDF document text
    • https://tcremich.lu/files/files/65459923470.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/ranefunedidesupop.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/41352991495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+minecraft+pocket+edition+pc+gratisPDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 17564 bytes
SHA-256: 03e4f6b12b7df4e45bb51bb28389fdaad5848f5277d0f793097ee42040721e44
font_02_sfnt_off00011fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 11144 bytes
SHA-256: 1fef7ce6793f5892245c9039ee47a5c2137611b55a25ae662504b6b38a844934

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