Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5da1842dbcd1fe…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 01:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 21fad26896d06d2c9692a525c6aab7b0 SHA-1: b4f875b0708d969eed064d41860dd258df1a13b0 SHA-256: ef5da1842dbcd1fe98b0c87930aebb10f1f327e5c5cc259e7c3d7625bb2b452b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action trigger and a small file size. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier further support its malicious nature, likely intended to trick users into visiting a malicious site or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://gamepinleri.com/calisma2/files/uploads/53447676677.pdf In PDF document text
    • https://weekendtripskolkata.com/userfiles/file/warejedirizasusanoxevaw.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/25548253267.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/nasavot.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/34897885383.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/49573431605.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/18707339966.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/36363912447.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/35754946448.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/69876709505.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/karirag.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/8a8850e33171a06407b1d0d87ed4823d/24349183711.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/nowidupel.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/sefazifot.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/3069482920.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/nodititidibepigowuwebefin.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/76763439499.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/juxozexawi.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/78189341621.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-12/20210912055650590442.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/27965214174.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/labubevipikudefukuropapo.pdfIn PDF document text
    • http://m2m2design.com/userfiles/soxepunadagawuponu.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/gogemepum.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7e297c44ootdk0c68vrr9rj2s9/57859275544.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/pugabafexewipijo.pdfIn PDF document text
    • http://boxethai38.com/upload/file/590364137.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/tazapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=online+convert+video+songs+to+audio+mp3PDF link annotation
    • 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 11220 bytes
SHA-256: f09f9989f1e7fd1bcf2cc1a589d456f72105eb21b99557ad8570e916f7b0a78d
font_01_sfnt_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 13880 bytes
SHA-256: bcab68d6aa185558f4041ba44d5b4b24e60a96c7181d13e1ca538289c8cb2198