Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ab53bfa75d161b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11a6c15f4786272d967d7a76e47d44e6 SHA-1: b584155a4eaf1b76a4e45e91365cbd087545cf05 SHA-256: 18ab53bfa75d161ba32caf4904a95c69ad0fbc368326de11bfd91381b9f908fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious sites, indicating an attempt to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://makesrealsense.com/ckfinder/userfiles/files/60771222236.pdf In PDF document text
    • http://sbs-group.co/userfiles/files/12051394915.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/41975660964.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/kaperizowubebokexuj.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/lumuzobixateludidewinit.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/6895197766.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630640592.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/55861959983.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/jimezibavaximifiwe.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/dewegovosuvijetozej.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1d2543a5---34156724679.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/90404266261.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/89137043979.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090515502773499.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/40913831975.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/35191906245.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lesadefefumuzimup.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/mimijewi.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/80859215871.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/40882907914.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/81731258580.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/78876524048.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/wisipajewomatomawokosa.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/pudekutaxuzinevesofadebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nintendo+ds+pokemon+hacksPDF 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_off0000bbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF5 10704 bytes
SHA-256: a2ab882bba31e966f5f1de55d7aa3117fa6c4a8a868a0fd99756f3f551bba510
font_01_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 17608 bytes
SHA-256: 457883fa30ad9a8cab0bfcc042ace205be556888f437f52db0dc661bf63897c5
font_02_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1