Malicious PDF — malware analysis report

Static analysis result for SHA-256 804166b997ccaa33…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 11:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 258f4ce03c515ebcb0c60cc8df155f0d SHA-1: a5dcfa2bdf306bfb8e244830158ed40798f69e60 SHA-256: 804166b997ccaa330666f6a71cbceb01b41adee28dade4701b771114ea404b72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the heuristic for disposable link farms strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=cartella+cestino+android PDF link annotation
    • http://zopos.zohukum.com/ckfinder/userfiles/files/38458140251.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/bewegawodoxubamomiru.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/98623588370.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140293508735---zetafubuve.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/16105273934.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/72843046001.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/54680055883.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/fesebab.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/19195979872.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090416034673499.pdfIn PDF document text
    • https://revive.fashion/upload/files/garuxerubavixokoviva.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xurikikurefanepodopivox.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/53554585501.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11498188259.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/33854989134.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nilazotowesiwag.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/14150544831.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210908185415_4tga68.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/81269457513.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a6cdefec---todazerexaf.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/dexikowodipagabaj.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/ludoradowenetesifapada.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/43219658418.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_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 10396 bytes
SHA-256: 27b08c3faee7b829a8d2a75f6f63b5544e3a2791cbecd673b537fa86669aee5b
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 17180 bytes
SHA-256: 4b1250874d74524d37e7f7dacdf96fc548072e172b7e529cb6a94c9459fc60bb

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