Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcd34817dfe2102…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 00:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bdd5a02f36365d6b3c3bdaed5b6bbc2 SHA-1: c3423c220488f36b18889555127d1b1c21658d69 SHA-256: 0bcd34817dfe21020257b57140c6ce49077f54d59981a3ae6d8cbebb5059e6b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/pubiroginozazososugafif.pdf In PDF document text
    • http://www.monts.sk/upload_images/file/jisikopofovariwajo.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/64471675583.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/lazedom.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/fewuvobigajarebutix.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/36978824598.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/mobarax.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/35454527143.pdfIn PDF document text
    • http://hydrem.ru/images/file/71714335552.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/rilokubupezaku.pdfIn PDF document text
    • https://sitarasign.ir/data/file/2708980177.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b6085089---rekejewobula.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/duvilazugud.pdfIn PDF document text
    • https://reha.bg/content/upload/file/63363436630.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/tadekodawujanozoligo.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/31559258710.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fidadolipiwefonutosupu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/80308290814.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7cf6f1c9---gobezamevututiviwofimup.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/87601554273.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/20032448063.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/kutedinobiratezikulu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/jijawizipujas.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/60768383320.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/nijuverozibofisiguwopov.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/jifukozenatepafota.pdfIn PDF document text
    • http://halanmilk.com/upload/files/xikimubudivukojijoxipujuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=advantages+and+disadvantages+of+event+samplingPDF 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_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10788 bytes
SHA-256: 8471c9067d0f3d3468d4adfeb2390b9f7c7c33bd54023b2f5818746d0c9bf1c0
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 17320 bytes
SHA-256: 1bfcba70369a3cd5ac6798b6f8d22639b940472750713ed92a339fd827babb3b