Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf622209ffd5286…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 23:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b2f0f0c69d537c13f4c75d414a10d80b SHA-1: 4015d15715b76bbc5eac69f44c2a547e8c4ac163 SHA-256: dcf622209ffd5286b7fce4b87938376e0a4d12e2afe1d166eca7e972dc87ac26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, suggests it is designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=exercises+on+has+and+have PDF link annotation
    • https://mabuksusu.com/contents/files/mevoxi.pdfIn PDF document text
    • http://ipceurope.be/assets/file/2743818130.pdfIn PDF document text
    • http://apvn.info/userfiles/file/30472020885.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/95738838114.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/mazifitevofefovi.pdfIn PDF document text
    • http://i-physiology.ru/upload/dosabevewerepin.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/38780981408.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/dagovibap.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/19190568523.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/busita.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/fajamurizagekexenexexi.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/38312812956.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d495ea99b72c7d54a79c9e9115eb8f5d/15347856028.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/sowedenufi.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/xupupemipuxovemawetiz.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bugalaja.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/vojodatosusiluke.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/3465214151.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/bulitajoxelabisiliguniv.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xufupibudogigoset.pdfIn PDF document text
    • https://schmitz.cz/res/file/judugolarolagoregeku.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/sadexapopiw.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/potesijuwi.pdfIn PDF document text
    • http://chipgene.com/image/files/20210916_012145.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/89761417396.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_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 15168 bytes
SHA-256: a09f59a8d2d4a626dc0efc609e152b4b3c3f06afb7cd267a1faf905774a86e1d
font_01_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 10472 bytes
SHA-256: f4e3f3c6f1b6e36b3b8af59f38935894fddfef2276752a4fa540228a1369edba