Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d88df8ef06f0e79…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 03:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea3efb8794e52619fd9b8f9a1e114e1e SHA-1: 2d8e76b781c957475f7db988e087a459fcfec0a1 SHA-256: 2d88df8ef06f0e7902e7b853f29d4281498690e5b12ccee7eeca55a436f0a45b
166 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains instructions to disable security software, a common tactic to bypass defenses. While no scripts were explicitly extracted, the presence of external URIs and the overall heuristic firings suggest it's designed to lure users into a malicious download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://staresecurity.com/userfiles/file/19836687403.pdf In PDF document text
    • http://ccspatti.org/userfiles/file/tujajixavin.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/95673674632.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/mivuvudewuketodurizofuj.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc64b466---89629889826.pdfIn PDF document text
    • http://velisend.ru/photos/file/dinaxusejevekebazotodi.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/39720697712.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/kalakupatavosi.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/nibafoxagumo.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/25668514338.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/85354139105.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/06311dd9606aa7feb978fcbdcdbb1fd6/geburiteguvu.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/rofidugapafuboriduzu.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/biveravuwivolibe.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/56592839944.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/voretulu.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/kekuzotu.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tixovisorafexiwavutofi.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/42014253129.pdfIn PDF document text
    • http://napiarsaigh.com/images/62774571175.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/mutaluruwepirinemukexisuw.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/69931886300.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/15349835534.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/jefobakabegaditelesikeja.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xipubeximivobakar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+unlock+android+phone+pattern+lock+using+kali+linuxPDF 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 11164 bytes
SHA-256: ada48bc3c6c3f492f0226489485a95533c3d25a4a9d1db557c8bf264117feadf
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 17516 bytes
SHA-256: bb3e878ff74f2a7ce8446b710ecbb292221db6c13fb0a48857c84f9219bbe9e0