Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c604fac5457c23b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 15:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a637364c97c94f6be012965fddc6861d SHA-1: 0acd7548e5bbd8b7ace6b9e76728d6d33faff2ee SHA-256: 7c604fac5457c23b84cc2ad8dddfd5202651353d4b2ca08ebbbf22810852c3a4
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains and utilizing UTM parameters, strongly suggests a phishing or link farm attack pattern. The document body was unreadable, but the heuristics and URLs point to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5296

Heuristics 4

  • 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
  • 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://pixomot.ru/uplcv?utm_term=latest+browser+for+android
    • http://ozanatalan.com/iboard/includes/userfiles/files/bifenike.pdf
    • http://agisinfo.ru/uploads/content/files/73731604161.pdf
    • http://kitpaisal.com/mypicture/file/32144462344.pdf
    • https://fallahi-sch.com/userfiles/file/89102540306.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ad2dddab7df3cfcc9a4ddced8d10f1cb/40000382899.pdf
    • https://styliststudios.com/imagesTE/file/bewibudabuwob.pdf
    • http://orthopediedelft.eu/files/44579849048.pdf
    • http://rydelko.pl/userfiles/file/2303531759.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/14497402541.pdf
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/palapisoragolerizefaza.pdf
    • https://777mto.info/contents/files/12871923091.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/tawikalowijek.pdf
    • https://sharmtocairo.com/userfiles/files/97834090104.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/87520642054.pdf
    • http://csim.jp/ckeditor/uploads/files/jagasaxubokorukexakof.pdf
    • https://maciejabramowicz.pl/upload/files/file/dodivukavodimodi.pdf
    • https://curvy.tw/upload/files/1102878934.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7d4519aa---87505798384.pdf
    • http://cgemfoco.com.br/ckfinder/userfiles/files/74263383745.pdf
    • http://www.jindatunnel.com/up_files/file/69557062909.pdf
    • https://piphoto.tw/uploads/files/202109121925469685.pdf
    • https://agape4u.org/userfiles/file/50651255022.pdf
    • http://rovitek.com/userfiles/file/43141995871.pdf
    • http://studiolegalebisantis.it/userfiles/files/96575031147.pdf
    • 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_off0000da16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16792 bytes
font_01_sfnt_off0000f228.bin
b07d93d2b2d94f548adf8e46cac006871901f03e085394b1df64c29408a01bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 18000 bytes
font_02_sfnt_off000120ec.bin
8656755385932483b12c75d25b9224fc73e3dd384c642bd95ed6ea11a298bac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10484 bytes