Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc95ae0b5b843887…

MALICIOUS

PDF

66.5 KB Created: 2021-09-11 09:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69143cd8a7547be1148dd635f1da8728 SHA-1: d53354a0b2fce1fb1148a5455596b49abc137d83 SHA-256: cc95ae0b5b8438878e92a1f95c22b12687c71c23c7acf1aadbaa6dae4175bea1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 4

  • 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
  • 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://crewmak.ru/uplcv?utm_term=how+to+send+files+from+android+to+iphone+via+bluetooth PDF link annotation
    • https://harkakotony.hu/UserFiles/file/warekakedamuxenaj.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hre6gnlj0bi55kgbvn070n5li3/nezuzujiloxaliwuvim.pdfIn PDF document text
    • https://andhimazhai.com/images/files/romokuno.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/3233388332.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/75601033249.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/43955453375.pdfIn PDF document text
    • http://reflita.lt/uploads/files/60060707678.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/wikanaro.pdfIn PDF document text
    • http://xsteelstock.com/d/files/wivamese.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xovitedo.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/4474897226.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/raxokijavixusu.pdfIn PDF document text
    • http://ch-yang.com/upload/files/24529126721.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/22662752268.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/foxinat.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138f04e8c879---potutamelugosiwu.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/fobifuvowisuxekex.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/20637537731.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/39592627082.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/44683405499.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/50528411199.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/pibozomamifuriloboxete.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130191a9fb71---renot.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/zofopekonerasira.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1