Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e23946e016bd9f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 21:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab895f79473d59b216e1d367547d2c84 SHA-1: ffeb6948d779d78f7bc44ca172e8313509a3d6dc SHA-256: 45e23946e016bd9fa6979ea2779ab93691e60b792aade2191092d7ade3067da1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing directly to an IP address, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is hosted on disposable infrastructure and uses UTM parameters for tracking, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://exihomes.com/userfiles/files/moxedodesugula.pdf In PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/73757715576.pdfIn PDF document text
    • http://artio.pl/files/files/35809603284.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/73127102154.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/puzuxaxivijepik.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vagazuwofilijo.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/13681336720.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/28745972617.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/64009393470.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7a9ad126---vunuwol.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/32166620143.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/88617699398.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/16449384058.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/mikanajus.pdfPDF link annotation
    • http://taiwan-casters.com/userfiles/file/76238905016.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/70914916885.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/navudoj.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134419dcedf8---mafawubaxesevawazefu.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jigadubimojaxu.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/9384244989.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/xosipigixudavite.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gegag.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/rugejapanaxoxuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=computer+keyboard+apkPDF 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_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 10620 bytes
SHA-256: b10cafb869c8d57985ddbe52494096b05bcb7509be1e48788cc3dd1b4244c4b6
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 17628 bytes
SHA-256: 37bc5485a85890eb2e26b0624dc39a9bf86de3e7f6bfe2424dcc11524e01984d
font_02_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1