Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a889e6db12084b5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 23:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52ac0414bb7f7e559c94e647413695cf SHA-1: 87464c83f1fdcc3ce4cbcaa243490dfb6e1d7cae SHA-256: 2a889e6db12084b57f2db213a7d42a3bac7b4f4238a5a4aa38fb289a88b9ab06
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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://huntic.ru/uplcv?utm_term=play+store+java+app PDF link annotation
    • https://marblobathware.com/app/webroot/img/files/2489697732.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/35672475960.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/fuzogelijujatiwaxot.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/32864109563.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/18061290403.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210913_150315_126.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/6268755793.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eaa45b7d8---51578802923.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142d7abd6748---wogelifazitaxuwamexugedez.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xizefulev.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/dulemedunelutuzedi.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/wifit.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/15578069524.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mewuvimujipusapuro.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/naxetisewobozulejak.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/14600342375.pdfIn PDF document text
    • https://harmony.im/userfiles/file/76617452861.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/mepavalilabesixubebozavu.pdfIn PDF document text
    • http://kim-clark.ru/files/file/92061670009.pdfIn PDF document text
    • http://wwstationery.com/files/file/28132923197.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/zuzetukemoravufo.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/46610891206.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xubimikubebijabomof.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/96704566341.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/59708511263.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/51244633965.pdfIn PDF document text
    • http://ilkemymm.com/image/files/35301205396.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 10360 bytes
SHA-256: 709cb4be63a691aaf3a65d469d2afa3f7e0ca49c47239e97f11490fbcece9488
font_02_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 17588 bytes
SHA-256: 1c558014bd9653f363e0ee22dd7357f81f4308efb126c57a98a033d2612c4eef