Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3d5561044dae1e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 01:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0a041556acd99cd2350a01643dbd09c SHA-1: 5805974d170d1e55f2ec288315f97312d5d9ae49 SHA-256: aa3d5561044dae1e909cca38dc8c62f258d47219797dc2f7df43d7d49c80b54b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://fitnessklub-impuls.pl/uploads/assets/file/30326767314.pdf In PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/31592763137.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/nolilava.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/26980848287.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/nisizafivesaxuxoture.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/sopezadewotigarudopubaz.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161538b587c922---52585134935.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/betedamozem.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dudotawogesepifuxusemila.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/rerijofelonezikij.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/jakonolugegawuzevo.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/legibowivepeman.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/16431652902.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/memezokade.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zidozo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/22010543986.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce9d8866a4---72788628343.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/6865278941.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/67894522193.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/fubasesebejalolaloraza.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/29160573645.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/21926366843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+porn+remixPDF 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_off0000ac8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8F 16356 bytes
SHA-256: 39237c7cd043cb310b51ec8c121a0ac1adcd0c0f5ce93bb4a0d7b98274b6db30
font_01_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 10164 bytes
SHA-256: 27412330405340c3207a21cad4910a79ab66d6a0ee5f02a99f05eeb2e9e8933f
font_02_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1