Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e1a64181569c8b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 10:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8a0e4a1de1eb33456a0761c31177dd66 SHA-1: fec4a35e34becbdc385b2cbb9510186343529016 SHA-256: 91e1a64181569c8b30681d4ae0605790bc55d3396c3bec608e37fdb2289def43
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thongthien.vn/upload/files/27174928533.pdf In PDF document text
    • http://pospatrans.cz/UserFiles/File/fowukir.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/67024844341.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb00f01e5---1839413858.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/waxenisunekax.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/93185998022.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/79aa6fa6a1f8c758691a52670128c7f6/lumosudinopig.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/38361112859.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/gojovege.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/kadisolamelunoguwa.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/23824436090.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/58700863207.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/932590053.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fuzenobemereguxa.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/nekelelarimibapeli.pdfIn PDF document text
    • http://elsped.hu/files/file/guxuzuriruxixizuz.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/xelokojulaxosa.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/11606865721.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/duzabanadefomiwekotanas.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/gogirulujataveme.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/81122987847.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/67795106529.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/18626005134.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/xejefexotizezojafokipuf.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/50782221594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=james+stewart+calculus+early+transcendentals+8th+edition+solutionsPDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 16052 bytes
SHA-256: 62bcafaac9cb93c4e7143bc659485ab19b11672b0b16d06cb819f91b4e0b620c
font_01_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 11136 bytes
SHA-256: 7b17d24942e00991bf043d0e0eb8a78e600c4d69579d187f96a278f1a7af7e40
font_02_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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