Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b665d251d58a51…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 02:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66b33a95763fb464b88020886fd3f95e SHA-1: cd819cab65742a8f4e2f54139626aab698dc692b SHA-256: 21b665d251d58a51939fabc2c069fd71cdaa97cca1d5d9b573aa1e02e20780ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one notable URL pointing to a domain that appears to be a link farm designed to redirect users. The presence of many distinct hosts and UTM parameters suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=mario+apk+download PDF link annotation
    • https://solidpractise.com/files/userfiles/file/77870386527.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613595e250898---wevodorazifefepovezo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/27131572559.pdfIn PDF document text
    • https://zhansq.cn/upload/file/42662394843.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27201516280.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/xulajafimaxikivo.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/melegutodugeneruxasip.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/49136918052.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/73654975861.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/6951803629.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/tiduwedarun.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zulagitivogupe.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210902_023556_6770.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/40420998500.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/198019589961319400a99af.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910191701295319.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/21883094132.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/totipetawise.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/bususo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/39864902634.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131630a8ce09---deravofiwanokusidowanu.pdfIn PDF document text
    • https://bunianco.com/other_files/File/mudumataj.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/sonafewupopolazasilugiv.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_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 17988 bytes
SHA-256: f255513346da50719e5931d7cc790f2d38976685879ef7bccce532767096c100
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 10156 bytes
SHA-256: d649a5c43f2c61e1d032320ba45951ab5a62a07ed9b3ece287749d803df88eee
font_02_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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