Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eb200fa6a309ed…

MALICIOUS

PDF

90.6 KB Created: 2021-09-14 04:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea4155940f49ece7603b681aa55ddc80 SHA-1: 244c4ae9cfc0251322ad2d99767a97ce4a39b8bb SHA-256: 66eb200fa6a309ed0f83d87fed2e0c056251b1b2f789df7357becf03f7d34e78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=skam+s3+ep+1 PDF link annotation
    • http://mprime.net/ckfinder/userfiles/files/xaloroturasebirura.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/89913945126.pdfIn PDF document text
    • http://nfc.soo.jp/file/8150085403.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/xerawojawowiramajada.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/84199888627.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/velomup.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81618129923.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161338e1759644---foxevibudasejufobejen.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/ximiponanapux.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wabepunubefepi.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/jiros.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/tqqio9ntvn2ei8um0fl08fdf05/nebuwetome.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/78327962813.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/xaratelazomiviti.pdfIn PDF document text
    • http://nensi.si/upload/file/bizexiwavavoboti.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914055127645153.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/83230226424.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lerowemexos.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/51399619679.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/15614032909.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/57860972493.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/99264063487.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/4072275117.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_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 19208 bytes
SHA-256: fddba1f64ee374030e22b8e47ea3868f3bbd92d8b17614df578cf1bd371cf6bd
font_01_sfnt_off00012dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD1 10244 bytes
SHA-256: d6d69c6bd593b9a054a5b58e18691918f4768733290de2710382f7f561aeb6c6
font_02_sfnt_off000144f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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