Malicious PDF — malware analysis report

Static analysis result for SHA-256 abced032eab0c6b2…

MALICIOUS

PDF

89.7 KB Created: 2021-09-17 20:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23718a07a157291fddba270cd66225b5 SHA-1: 84fe095da5c12f5665b7a8ecbb29c0878cfd3426 SHA-256: abced032eab0c6b229152cad77ac90b5020328619d0209071cd93f413cf8879d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true destination or distribute malicious content. No scripts were extracted, but the structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://behbehaniprojects.com/uploads/files/30326752179.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139b1adcdbb0---46199129768.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/5975556994.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zonorofogedemulisodeg.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/6291181020.pdfIn PDF document text
    • https://photojet.net/userfiles/file/naxuluvunitapewu.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/2125223959.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/34536157614.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/83336149034.pdfIn PDF document text
    • http://ergakiland.ru/files/files/98110183345.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/24976615130.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/pilogezinakikew.pdfIn PDF document text
    • http://mlight.cz/archiv/file/makasoj.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/d5llce85ia04e57irspgq8dkf9/49965446497.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/rifuk.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/pazupozovur.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zibituti.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/52889892517.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/87228047100.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/pikemipevijemutunika.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/35322614118.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210904_9805AC2105C34494.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/63243840919.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/50430994854.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/farugawagavotureli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=software+tablets+androidPDF 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_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 10648 bytes
SHA-256: e94ff9ddafd7aa62862f17f21acd926c4816af63e4eb82eca9cb6b96aae0bbbc
font_02_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 17740 bytes
SHA-256: dfa40280fcb8a5db993a79cef5045775fec07ff30edf571feb28b0c27f9f6a4e