Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f65a4c615c817f1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 21:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b955e7fb2d055c94164c1a5894391c0f SHA-1: e3f52d8a85e9b2b2a10c56efab0e67324be93580 SHA-256: 0f65a4c615c817f1fa222106c70943b581ca5390e35e53970a167bfed05b8bf3
166 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. The PDF contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm strategy, suggesting an attempt to redirect users to malicious content. The presence of 'LOLBin token sequence in document text' and PDF-specific heuristics further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://cn-biyoute.com/d/files/54880986017.pdf In PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/roledakopuxipotezokoz.pdfIn PDF document text
    • https://castel.ro/userfiles/file/97354775856.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/sadavovozemefemi.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/xutisapepi.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/94112612271.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/webikawe.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/jizuxopabirolowuvubanut.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/58209150339.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/10866442098.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/45365798714.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/dapeweg.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kimerufitedibazebifet.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/29093671827.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/pafok.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b689b502---suxemixobulu.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vavinevaj.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/04c2mq5cjovvurcue1frbppsi2/fukexuxe.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/zavavilakiwamawenir.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jewite.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210909_F149FF790B14B3CE.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/ribamaxofel.pdfIn macro / runtime command snippet
    • http://letnipohar.cz/upload/file/motadafe.pdfIn macro / runtime command snippet
    • https://globaldreamindia.com/webcms/file/42849548628.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24926870334.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/rarikofajok.pdfIn PDF document text
    • https://monamifrance.com/FilIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=green+farm+3+apk+downloadPDF 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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 17140 bytes
SHA-256: 1f4950a0bd0ba7d92b393ecb37eb5feb8b49cdc69efdad82662b493f2cd73b81
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 10692 bytes
SHA-256: 92adbc818c28bd1c1ef39bc0f6cd2486423033f490c76ce9375e52ae16621a31
font_02_sfnt_off00011ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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