Malicious PDF — malware analysis report

Static analysis result for SHA-256 33034c10be869eb6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-09 11:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 124c75b509388a9639b02d7ca0f6637a SHA-1: e9d845be82bad60810465a755b553066784ea23f SHA-256: 33034c10be869eb68186e7655af50cae5abea516ceae84ca37171379107b27aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=by+the+pricking+of+my+thumbs+shakespeare PDF link annotation
    • https://srmhomes.com/images/bulk_images/files/12695934561.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rapoxawataxaxuton.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/19866151062.pdfIn PDF document text
    • https://ambalatender.com/upload/files/55242333078.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/61844614769.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16132898f6da74---16632830710.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/fadewizuzenegemafos.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/gojawog.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/32253969160.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/19976986026.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210906081035.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/57921437189.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/kigidefapuvifelipo.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/furajusosaledavamuluxa.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/zemerekiromunodudos.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/88407461167.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/kuwesolesaden.pdfIn PDF document text
    • http://hainfelderteich.at/lajokanesuva.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/tawepobave.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/nuseja.pdfIn PDF document text
    • http://njchemland.com/upload/files/kosevomawonekabetitokam.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/1801476681.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/25e6b7ca45252576d4632f425720793c/lotoxikazedipadelujaxefe.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_off0000b187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 11380 bytes
SHA-256: e7cccfa64bdf154dd4f1bb96c35401056b3b246dc341e9d4f4e720b5f4c2f580
font_02_sfnt_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 17556 bytes
SHA-256: 1d5c46bbbfab8a701d2fe29cac0c5525c6e4c36ccae8c8eaaa659a8386c36526