Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa2b88a10317ebe…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 19:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8feacd82bb2b458cb908eec538c4d61f SHA-1: 08aa35fd126f01333483584cdd0363f4ac644339 SHA-256: 4fa2b88a10317ebe51e51f720d1ba55b52fedc2a127640f44b577b06e91333b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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
  • 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 https://krisoc.ru/uplcv?utm_term=unlimited+coins+house+of+fun PDF link annotation
    • https://marblobaths.ph/app/webroot/img/files/risokobozeduvokol.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/tavaxumulatodojaropizo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136521d6424d---suzalozotewewamez.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903202753534341.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210926_CA2A7717B3F8E719.pdfIn PDF document text
    • http://iknow.pl/files/file/39020744011.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/nojamekonisewidaj.pdfIn PDF document text
    • https://equinox-e.com/upload/files/zabisix.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/43732494245.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/kapidovasaser.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139977b2e833---kepuxefesovugoviroku.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/xonejegot.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210919023107.pdfIn PDF document text
    • https://shevian.com/images/file/14855912625.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/48318861.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xamusobezepamo.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/sutodebuwef.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xoxajuwalutizefuwurefur.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/kopafuwafus.pdfIn PDF document text
    • http://haki.vn/uploads/files/72213368692.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/gekujologikadukubesuga.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/81426236052.pdfIn PDF document text
    • http://nanopena.cz/upload/file/vomofo.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109050256173661.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/40003351147.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/midezovog.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB740 16724 bytes
SHA-256: e0bc4b04fffa8a2b922bcdb1db6abec96ce34c031139d52c1be5c19a588ef54f
font_01_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 10588 bytes
SHA-256: 045093a10266c410321db13e58be0b60ee4718b0dfecd1be80df4f01167812d2
font_02_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1