Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8edb8b91e701772…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 16:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9543991de2e55da930e47478cf10337b SHA-1: 7ba332b700d3805b4d075f604c0070332b564ff6 SHA-256: a8edb8b91e701772722fea0ba2521756e9a2c4e497e4fece79bcedff21492c5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

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 https://crysiq.ru/uplcv?utm_term=compare+all+s20+models PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///wukarupe.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/xawuludekikejatati.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/nururej.pdfIn PDF document text
    • https://songhong.info/userfiles/file/85229930612.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/66731479849.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/jugasusip.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/80228950122.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/42372926608.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/36023501071.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/14343441097.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/97603119177.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/67372750676.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/wojilikutupebuzavusa.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/zarajakanekagirewovuvo.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/23581179767.pdfIn PDF document text
    • http://debten.net/UserFiles/File/37015160551.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/wupufa.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/31918830641.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/kozojatufagokaw.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vafiposupenixepidi.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/kufolexofabogusejos.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/26119715810.pdfIn PDF document text
    • http://195exim.com/datas/files/nigakapefagovax.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/bekuzitozepasij.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_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 17256 bytes
SHA-256: 07ef6ce893e94693de39a3279cdf8b1e46aaef3578f2cdbd6bb3c2a3b2806fad
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 10532 bytes
SHA-256: 4d084f41a69e620275ec35ebeeabeda11315140321f91ff5b5797bc48ee3de44
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.