Malicious PDF — malware analysis report

Static analysis result for SHA-256 254c267d4868ede8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 02:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 293e8bef8130c2f8d50f4857c18500ae SHA-1: d4d4a5e6e4f56b70d1dcb318f2f6c6434555183c SHA-256: 254c267d4868ede8b7832002f4b4b43f746cda7eb8821ae1771211a0967d57c3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to host numerous suspicious PDFs, likely for phishing or malware distribution. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/fakabuberedesefigodoje.pdf In PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/betorovanipolimexu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399a79d358a---77246960760.pdfIn PDF document text
    • https://umutfm.com/resimler/files/jabobuvefolizuniloluke.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/56284738563.pdfIn PDF document text
    • http://fuoriscena.eu/file/liviferijep.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/womobumetafemumamalinefeg.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/vafusafopowozavizo.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/54791599973.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/bomaka.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/36832381639.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/4060261961.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/20895461725.pdfIn PDF document text
    • https://pmms-online.com/assets/file/kusasazipizedilerug.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/6663953531.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/74789264593.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/nimuwexituxovifa.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/86178751028.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/vodugikul.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/22839879785.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/51939004231.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/74653401428.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/vifuvelije.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/9749937210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=adobe+premiere+clip+apk+mirrorPDF 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_off0000aeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB5 10516 bytes
SHA-256: 16165db7a2f1faa64dbe4caadadfdb07ca5b36bc3cd18f11cfd505a70f17f930
font_01_sfnt_off0000c664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 17528 bytes
SHA-256: 46425e835d3f6933c9e066cf092c250bf8c74e4c60f9644b1d40859fe704ca56

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