Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ff0522d3b19466…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 11:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61cbcf89288c676e491fc1498813ade9 SHA-1: eeb795cd122d4f38d356f0e8a0e54eeee09c6751 SHA-256: c1ff0522d3b1946672f0f8168e3747db66e5f3d57d6b66f6701533985571c2ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://medvor.ru/uplcv?utm_term=am+maj7+chord PDF link annotation
    • http://digifast.cz/userfiles/nizod.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/47809255626.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/winanugebekoji.pdfIn PDF document text
    • http://slsnn.ru/content/files/fajezuzomubag.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/43029591699.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/99741314082.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46224839447.pdfIn PDF document text
    • http://szhlfz.net/upload/vitefup.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/83001535126.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-04/images/files/lutamejitanigasa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea45084690---29962938910.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/resitudufudu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/matumulekexojoves.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/wotesejibapesasesojefu.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/83684630181.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/14267068164.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/sunalujodigarejej.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/biliwokevefujo.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/futotoxubogagi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161418f193ec0f---51302292753.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/jamepujejowowasifu.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/82106839947.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/57132728118.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_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 19088 bytes
SHA-256: 57ae4e2315a8482670b5aea6b6f88e5aea5ff729f83b6dad20c1a7bc29bed5f7
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 10156 bytes
SHA-256: 6b7e992a2a3dd6c4c70a33f6aa1ce2c1d1b7ea279091903fd1ed4f8fab4af237
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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