Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2eed461c427a735…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 06:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5f711346a0d191c6e1177625ae67c20 SHA-1: 61a905875067247dfd35762329e820e5ef2561dc SHA-256: c2eed461c427a7357ca468f5e00ede36b2e97d6ef7db19780c2a76d8f9df6967
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, and the 'utm_term' parameter in one URL suggests a lure related to movie downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://isdoor.ru/uploads/files/retilovogegubu.pdf
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/marupulekika.pdf
    • http://vtaky.sk/media/file/wepulan.pdf
    • https://portalbime.com/UploadedFiles/New/file/gopinukepofetomuvanaz.pdf
    • http://sjatupornservices.com/file_media/file_image/file/vevisebiwilit.pdf
    • http://musicincw.com/fckeditor/userfiles/image/tedemitasukojo.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/xadolarabotovukerikebuxo.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdf
    • http://eternaseguros.net/files/files/28945945242.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/rukuwujuze.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/319d07388811fdfa5cc25cabc4a2fcc1/fubusedabaroj.pdf
    • http://zzps.pl/userfiles/file/nepamabulepis.pdf
    • http://pelesiuvalymas.lt/i/File/36389526798.pdf
    • http://gfb.it/upload/fck/file/vezut.pdf
    • http://dietaltop.com/userfiles/files/58671777405.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137670ade09a---21640689406.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/zigefojinewovenodefamu.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021915324107.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/tivugigokigitagul.pdf
    • http://freeware-software-download.de/uploads/editor/file/zujexadigedogojutijusiro.pdf
    • https://ihappywash.com/uploads/files/202109020315521244.pdf
    • http://studiogallerani.it/userfiles/files/bomuwilotisetolijalu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+dark+knight+full+movie+with+english+subtitles
    • 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_off0000ce8e.bin
c76f35f4f6efa8f81f44045cb036464be1fd7e26933616811a7fe03a352361aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 16692 bytes
font_01_sfnt_off0000f98f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16792 bytes
font_02_sfnt_off000111a6.bin
70a1bcfb916eb7f0f546c45272cf80244aeecb808e32c5e45c862d1d4a06406e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 11248 bytes

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