Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64b38fd4a2796f0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 10:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fdfff8250022f6deaf8bd4745e61f5d7 SHA-1: 5ee129ce8fe3789424d9884aa7e8aef6182e32d4 SHA-256: e64b38fd4a2796f0d229fb1d144a0330f0f2044e8efdea127b4584d7256d5752
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to malicious sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates a common tactic of tricking users into believing they need a password for an archive, often to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=short+games+for+android PDF link annotation
    • http://mixline.ru/img/lib/file/93354561252.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/00360644c2209c88486bdae3b760d66c/49519171658.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210910052003.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/kusitogopepufuvasutunagim.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/75943299344.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/9861317908.pdfIn PDF document text
    • http://nineslash.com/user_file/file/10480075822.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88325938817.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/24265950146.pdfIn PDF document text
    • http://gibisch.com/files/files/58485952195.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/saludofaraxadodoronufer.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/rezur.pdfIn PDF document text
    • http://sireny.net/share/files/38307753454.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352d916ae00---88910708110.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/dofun.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tubiwoselebulosuxaferase.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/butejukalawo.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/muborivobasigika.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911022018.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/tiboxewojuzesefidabo.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/4855143702.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/raranawobewumubigilituke.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_off0000b042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB042 16068 bytes
SHA-256: 75e1da8dc40cbea69a700c34411ea141450f7aa572dfe210ee0d2afa1a6f79c8
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10832 bytes
SHA-256: a0b54cbf9afa12b918436598f5619907f938f69455966f058fed2a0f2e3e6655
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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