Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8d2245e5ab1cf2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 13:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c425d3fe0641b05a63529a1c3798cc5d SHA-1: ca24abde4203209b655e70a40b9e2222a2a03cd1 SHA-256: 9b8d2245e5ab1cf28b183666315c43416e617d902ba0d09b83861726742c4ab3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm by heuristics, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The numerous unknown URLs suggest a broad distribution or redirection scheme, likely to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://szjglaw.com/uploadfile/file/2021090320302073499.pdf In PDF document text
    • http://ingmarcofaedi.com/userfiles/files/77681251768.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/midutegaz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/53728433890.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/77792020002.pdfIn PDF document text
    • http://www.og2c.com/images/file/watiremoki.pdfIn PDF document text
    • https://servicepapik.ro/files/73418081045.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/faxanobidupo.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/53804684418.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091602571773499.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/608971548.pdfIn PDF document text
    • http://skia22.ru/pic/file/sagegaw.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kogevejakekonomalewutasi.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/deperob.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145020f32e09---7341073679.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/gozedomixitodoxogolofogas.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/37428834440.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/putawabovawofut.pdfIn PDF document text
    • http://le383.com/uploads/files/bagubaduxavibaselejeb.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/36460615668.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210915195339_s1nizd.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/81923911043.pdfIn PDF document text
    • http://cycling-software.com/files/file/41044933425.pdfIn PDF document text
    • http://inistor.com/ufiles/files/91869598331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fastboot+flash+allPDF 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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10000 bytes
SHA-256: f5fae09086d439228fba701bea8f408f575a7f331d95b50444bd1431f8a78ab6
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 18236 bytes
SHA-256: 8d45007e4f0a89301301e0921f2d69550d84fe1e71748cb485d9a8083aa34d05
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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