Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbf22e1b84e332a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 00:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6538b49e6340f4ae55d64f99bcace008 SHA-1: e977ce4de835ff2f4fe71888448adbaf7a9f7394 SHA-256: 0bbf22e1b84e332a28f1a1ebf069e88d7f439307d7039594db1e561eb9d2bed5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://senarathgroup.lk/assets/media/file/61750749687.pdf In PDF document text
    • http://sedaciesupravy.sk/media/file/vexopesi.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/jemamivapa.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/govuzelozeluputotez.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/35732246727.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • https://filetorme.com/upload/files/26949417182.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/72763255225.pdfIn PDF document text
    • http://stroi-sistema.ru/img/40154938754.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/7351807735.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vugubemoxigujuxukal.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/19876519232.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/95612500637.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/22365434651.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109090253381888.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/lusivafevex.pdfIn PDF document text
    • https://norservis.com/files/files/waselafavofa.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/pideduzixituzapuw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149cd574854f---4006610098.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/ziroberakugadi.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/8302622933.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/xatet.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/lotomenikalokeluzomu.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/48424792420.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/73383907558.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/9234819101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=long+day%27s+journey+into+night+book+pdfPDF 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_off0000d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD274 11300 bytes
SHA-256: 83644d205d0c340d61e30028620470b9ec81dacbf9cc8ae9f8fa984e7610f0cc
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 17540 bytes
SHA-256: 7fe3672dc2b6cac46600e7d5afa2d3a71e96c51470ef0735bcb72ef0a0ad2c2c
font_02_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1