Malicious PDF — malware analysis report

Static analysis result for SHA-256 5680ab15d5ee6d11…

MALICIOUS

PDF

90.2 KB Created: 2021-10-14 02:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: abcd87718f786e933c5004b4a055f29b SHA-1: 7c8ad383df53c426f8186ffd22be931e309e0d8f SHA-256: 5680ab15d5ee6d111893ecf8b1e7459758aa859671ce074d0baf94a687e54b1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 5

  • 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.
  • 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 https://semangkabiji.com/contents/files/38841998584.pdf In PDF document text
    • http://yung-shun.com/userfiles/file/bubek.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/74678427916.pdfIn PDF document text
    • http://thrs.thriftstorewebsites.net/flash/thrs.thriftstorewebsites.net/file/80997820037.pdfIn PDF document text
    • http://chinalabware.net/d/files/54655016997.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/xuxusebibusuwubo.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/somawegimijil.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/42432639684.pdfIn PDF document text
    • https://atavio.ru/files/file/26019475072.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/97940481719.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/22383047712.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/22070366873.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/wewowareg.pdfIn PDF document text
    • https://seger.cz/userfiles/file/wajamojelofuwuxa.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b051074f39---8377058017.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/fesob.pdfIn PDF document text
    • https://planbmedia.hu/files/sokezaleza.pdfIn PDF document text
    • http://wawa757.com/uploads/files/nidigogazuferenuxawej.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/25327870592.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/motuxuvitevuzunaxibafusuv.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614168dd0e363---nidarowupugakovil.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/44605004522.pdfIn PDF document text
    • https://eniedu.com/data/file/20211003050856.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/46733487173.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/88152263886.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HKUGBsJGI0E/uplcv?utm_term=scientific+breakthroughs+meaningPDF 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_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 18872 bytes
SHA-256: 1c7523b78eeb6920e47d91c16d5a48a575370a8729a44beb9bc381fc9dd84071
font_01_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001411c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411C 11144 bytes
SHA-256: b6682bb6e9f1b9e3666070de072881f01258c867e7359a39d1106a72761a27a3