Malicious PDF — malware analysis report

Static analysis result for SHA-256 f376e83f710d4c44…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 02:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32630b23bd59cf098aaea248a1cbe744 SHA-1: 3b92b0e81902f021ecd0ea968283304e6ddd0520 SHA-256: f376e83f710d4c44ec77b995bb018ab63be5f9df5454973b14e7f53cc65eafb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=critical+ops+free+play PDF link annotation
    • https://sambelteri.com/contents/files/33711037716.pdfIn PDF document text
    • http://donghotam.com/luutru/files/rijutowemi.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/72066212249.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/pibatofefopivinelo.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xegetewatitutivirubako.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/kekos.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/navasup.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/wibagutetejapunokoluzeru.pdfIn PDF document text
    • https://castel.ro/userfiles/file/lebenegakapesutogeximagin.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/27383105701.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/zedemakut.pdfIn PDF document text
    • http://adveotec.com/img/file/71134259505.pdfIn PDF document text
    • https://businesslife.com/content/file/pedojopidejasux.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/41448589647.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/49647063166.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///52514202244.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161425334a0747---gudigokof.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/19462542554.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/48653694487.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/88003565750.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/netogidarafopikofowikoduk.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/mogod.pdfIn PDF document text
    • 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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 18424 bytes
SHA-256: 06fca96fcfe08609a2303e8931d414b0bf4d34fcea2aa35a688c9f48ea3a9c30
font_01_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 10512 bytes
SHA-256: e7eaabdf6d178ac2f9a389abeff0e85e675cbb4e9aec9f6a12e1eee6e0955c13
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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