Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce72c7205b5a3c7…

MALICIOUS

PDF

76.9 KB Created: 2021-10-03 18:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35c3aaebdda3a2c2aff7a78ff99cb602 SHA-1: febee2381b68558c8dfb52528f4c1256501e126c SHA-256: cce72c7205b5a3c77930060cc785b98db392e88ca9cc225124949f1977411a05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The file's structure and the presence of many external links indicate it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=what+point+of+view+is+to+kill+a+mockingbird
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5f24cf6ee44e58aa9dbcb315a5143526/diredutozawuxilejurarot.pdf
    • http://mlight.cz/archiv/file/molomosasawudakob.pdf
    • https://kamhosting.nl/ckfinder/userfiles/files/10561383096.pdf
    • https://tort-art.ru/userfiles/file/71390119997.pdf
    • http://massimosusto.eu/userfiles/files/sovovexanov.pdf
    • http://modern-pro.ru/files/file/xifixa.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/detax.pdf
    • https://ewastexperts.com/userfiles/files/88925820994.pdf
    • https://oferta.lt/i/File/90348426281.pdf
    • http://decaiyun.com/upload/file/210902152205012341xhgzpcri42l7.pdf
    • https://kapokcmassage.com/uploads/files/202109020220333829.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/taroz.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132671992589---zejotofoziwu.pdf
    • http://mannadey.in/FCKeditor/file/5012055946.pdf
    • http://jinruily.com/UploadFile/file/20210913075832351.pdf
    • http://kmsenior.org/file/files/31038607581.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/dexegiruvaxuvason.pdf
    • http://testplanet.nl/uploads/files/bigigodolekif.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/98870383839.pdf
    • https://petala.gr/userfiles/file/14408035611.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/93320879235.pdf
    • http://buddhavihara.net/userfiles/file/62226542615.pdf
    • http://evola.it/userfiles/files/xusomi.pdf
    • http://stoka-saarlouis.de/userfiles/file/kuliro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bef5.bin
fc12895490c921c05ba44205002469fde6a3554805d57d2655e5f1014df4c0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF5 19744 bytes
font_01_sfnt_off0000f2f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
font_02_sfnt_off00010b0e.bin
e1be32c630f25f86eef52d6df5b561449ec6f8a8f856fc821e134981cadda67c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 11444 bytes

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