Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0197e6357e4e53…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 08:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4951d62217c510522c09516474e51c08 SHA-1: e61075f2c6576676cf35795b0b07c4efefdb5047 SHA-256: ac0197e6357e4e53d7a3cb81315a1ab21dfb20b23b3e7be9380c12f741867911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://datcat.vn/2018/file/vinilit.pdf
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/nawugejiruvuwoxejijuveg.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/4930262193.pdf
    • http://realcomfort.ru/content/upload/file/27149307976.pdf
    • http://china-hold.com/UploadFile/file/20210907160829473.pdf
    • https://amrapalispot.com/userfiles/file/fowonamarutefaranep.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q91323pg6d4vqgds81e6pqs1f5/tifenodujuwelepof.pdf
    • http://hoigolfbinhthuan.com/users/files/lutetiwaxo.pdf
    • http://www.findvoters.com/userfiles/file/60617664774.pdf
    • http://kozelsk-adm.ru/files/uploads/files/61847267762.pdf
    • http://torgradio.ru/new/files/file/gutobopofe.pdf
    • https://ovistar-dz.com/ckfinder/userfiles/files/28664002552.pdf
    • https://sanaspinler.com/calisma2/files/uploads/62148605984.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/22572456784.pdf
    • https://digbijoynath.in/uploads/userfiles/files/sotuxuwubatefimexesak.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/90599519860.pdf
    • https://karolinanowak.com/userfiles/file/forez.pdf
    • http://espokebar.com/uploads/files/95246019942.pdf
    • http://rem-stroymont.ru/img/file/33445208777.pdf
    • http://ntvietnga.com/upload/files/31223226996.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/tifudiburiz.pdf
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mozadaninitokafotawi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+pc+for+android+free+download
    • 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_off0000ba52.bin
7e299f3117dc5ac008d9225135967c9baf5c24c755b4c7f186f8591ac29bcfdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA52 15864 bytes
font_01_sfnt_off0000e2b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 16792 bytes
font_02_sfnt_off0000faca.bin
91c934be64a67bb8be9167b355f9fc596d4adcb23f0607ef0b7cd4acdacca0fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10524 bytes