Malicious PDF — malware analysis report

Static analysis result for SHA-256 376a043f834f5c46…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 09:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 143ffce7f6b33f9e5db3cfb99b88978e SHA-1: 2b3a40e509b25c9c92761071081e70e8eb8f5e73 SHA-256: 376a043f834f5c464bdbfb894b40ac5b41ba57c080995ff28a31917c8d8778e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://fabrikando.com/cmsimple/images/file/zarajepajejeraratepanofiz.pdf In PDF document text
    • https://skl.deindrukdemo.nl/upload/files/85804945625.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/zapizunagavuruf.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/zolileferetakufovetuwisez.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/16318247273.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b084c1768---41436604616.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/97760155298.pdfIn PDF document text
    • http://glttek.com/userfiles/file/dajusobajowezozabu.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/jolepinufiluzu.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vosijoxedakitinelog.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614118af6b3b5---45608178887.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/majifubukibelarewiliduguj.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/5699272302.pdfIn PDF document text
    • http://netart.hu/userfiles/file/51675374389.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/6428621494.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/mabimakexiged.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/20610836556.pdfIn PDF document text
    • https://digireg.si/upload/89725809881.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zonivipodijakifos.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/lepavasopagivetodutaner.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rupimox.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/tumefa.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fatejironitavejiju.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/23915907625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+dungeons+beta+apk+androidPDF 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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 11072 bytes
SHA-256: f5f0a6352b5c256cd437147229e6048860a7480d7e738b4b9cbb77541bbf88c0
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 18236 bytes
SHA-256: a70542172a5015d2e7d1dfa42f635875673dc6ef6bb87c1ee0a49b800f4181c9