Malicious PDF — malware analysis report

Static analysis result for SHA-256 025b2c623da8c120…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 01:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56326856fd9eecf2f56dc0d4ab2b140c SHA-1: bcfd3b8e925ae37b2aeb46560c61f0cb6eeffebc SHA-256: 025b2c623da8c1200031d64aa5aac8032839fcfdaedab53f9659d859eda55d47
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links hosted on disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6700

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=android+games+2019
    • http://escritacontabilidade.net/fotos/news/file/1400004461.pdf
    • https://yantrasearch.com/ckfinder/userfiles/files/34995951013.pdf
    • https://chaletsuenodesol.de/files/47888608801.pdf
    • https://thaiwoodengames.com/files/upload/files/xopalap.pdf
    • http://thietbiantoanttk.com/uploads/files/96103661154.pdf
    • http://abwhopewell.com/uploads/files/30724120841.pdf
    • http://satakantaresort.com/user_img/files/74570523011.pdf
    • http://gamebonda.com/ckupload/files/wamutef.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144b856aed0e---tixiwixadif.pdf
    • http://expresskaliski.info/file/90638860082.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/70837773386.pdf
    • https://dusunceokulu.net/resimler/files/45888371189.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bcf815092---fetorusexafifekomorok.pdf
    • http://soleilboo.com/images/uploads/files/dirimod.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/65969023413.pdf
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/lakikegule.pdf
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/1653137577.pdf
    • http://driver-jazda.pl/upload/file/8600562795.pdf
    • http://murzilka.biz/images/uploads/file/veweselipipi.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riruwojuboxegawijada.pdf
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/4378297828.pdf
    • http://linhkienhunganh.vn/luutru/files/25687726865.pdf
    • http://bippex.com/filespath/files/20210923095519.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/suxapatadajeved.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/wogagun.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d2.bin
0f57bce99fe1809c65e9dbbd099f4086bf858c1bc7ba6b68c118a9deb25c2a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D2 17632 bytes
font_01_sfnt_off00011767.bin
185e959c64434624de4288b84f873e99e4ab551285ca0c50a312ddbaad58df49
pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 10888 bytes