Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bee47e2422f9ec…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 20:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 287f9c563efef5a7df27aaededd235ec SHA-1: 44cf58ee716df0bef669f40e613dbe273e37b34f SHA-256: 57bee47e2422f9ec87b41aacfb5719b9d6f5711bf1b104975bb162ae0e4edd6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://quiltingacademy.info/fckeditor/userfiles/file/86903427518.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e8ba29otd22ncl8ga6d04o3hf4/90446910984.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/67392761822.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/bopokofawedekoteded.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/senovuw.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/65571031103.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/52784019423.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109060051369009.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/63643231366.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/mijarinevavujudirabele.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109132021482572.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/20740598815.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d66623a00a---kodifexezozeregetololon.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913200029186307.pdfIn PDF document text
    • http://lawngo.net/fckfiles/fetupabogimukizeniri.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907154959.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/baxiditubajivajavatut.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/badexed.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kifegoziparemuviku.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/mutaluruwepirinemukexisuw.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/setudazelofi.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/xinutokigux.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/89432875947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=deezer+hifi+apk+mod+2021PDF 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_off0000b67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 10796 bytes
SHA-256: e33c9febad4c94b3cec4318f917a6ea78bfd0638f30f53cf35435b89d4d6c370
font_02_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 16208 bytes
SHA-256: f343d1b2551d6f5254a31c640de18d5a2c199b710ee32167464c0df3144931a8

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