Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0b9237bd604941…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 20:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 924000bd35e4f380ae5a6b199437e509 SHA-1: 33a3601a942c51b15845123836c65dcddcfa7941 SHA-256: fb0b9237bd604941dc4e0071cd4180df8c0f101782361abff04ae978bddb68a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sosonomo.com/ckfinder/userfiles/files/7503759737.pdf In PDF document text
    • http://jindi2010.com/uploadfile/files/vujizuvowogiw.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/153538248.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/galadovilalogavi.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/69941835785.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sawipow.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/4382782617.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///62838018561.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/virezusonetab.pdfIn PDF document text
    • http://classtool.info/upload/files/xoreregejavuxu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614823484bb27---3665825676.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/32613806899.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/81617123060.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/pefomedotetuludigiko.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/jipizotijasibu.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/lonavajifaxamosidigas.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/vanofebugazu.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/mukivuwamozesajukixidelif.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/lofevubuvava.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/98293802113.pdfIn PDF document text
    • http://hk-keber.de/images/file/jiwififovulufisibobi.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/90611260659.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/vekirivom.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/55653461338.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/63850757631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+words+do+you+not+capitalize+in+a+titlePDF 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_off0000b329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 16536 bytes
SHA-256: 1dc7efa749d5e33309d2e177536ec2d03ce6dd83f9e6fb0a5e2b30126794b26b
font_02_sfnt_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 10964 bytes
SHA-256: 838100db937880d81931105a88bc07258ac1623cc533ba6ba05fd019ef54496c