Malicious PDF — malware analysis report

Static analysis result for SHA-256 82898a53568caedf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 02:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5ca35495a86a8c020f228e2026cbf3f SHA-1: 63f039413cd31d8b5ff0e79adb89f4a9b7feac33 SHA-256: 82898a53568caedffb77d7e43e41c7633cb110f664708d9c3fbb399812a9ee07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm hosted on disposable domains. ClamAV and ML classifiers identify it as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and URL distribution strongly suggest an attempt to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=free+phone+to+pc+mirror+app PDF link annotation
    • https://anfauglir.com/images/file/wavefivekevojojapikiz.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/lefopepizomojozujovimexok.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/movimaguwukexekugokaroma.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347df894aba---xuluzuri.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/mojebuzubavi.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/jedafozimidi.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/60252159835.pdfIn PDF document text
    • https://partnermind.cz/images/files/kawemalosudakuweroxijepof.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210916142735187.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7d612dfe90bae2e623ba032c029f8ee3/56523322339.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/xezefubofe.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/pogakewavokirojepa.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/92251398354.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/zopomuwisufelaje.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/lotaj.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/togadabusatasitan.pdfIn PDF document text
    • http://flirdining.com/uploads/files/57944777699.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/48245918155.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/dirofina.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/tunesorabipapojexonuzejek.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/65642928625.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/82953366019.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/bubog.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/95852428982.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 10404 bytes
SHA-256: ad97f871923bf3dcb27538137ff44663ebb80768d1fcdba8d99a97bf943d6ce4
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 18760 bytes
SHA-256: 649ad30063963d9d249358419a7ac52610c069112c03ec844e50b3da88bb0007
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1