Malicious PDF — malware analysis report

Static analysis result for SHA-256 4629eef9ab7471a6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 15:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f381cc9f93de46cb71741c09508a29f SHA-1: 21425393d640e581f201b52b07bd42d662df6cdc SHA-256: 4629eef9ab7471a6804f37aa0a4413ad930700d46a211acef95b0b5ec267a28b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://muzycznescyzoryki.pl/userfiles/file/83019940688.pdf In PDF document text
    • http://kkagro.com/media/images/upload/file/ruvejujo.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/84166412898.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/96832205052.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/80676276031.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/raxul.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/26368857057.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94c48b860---98505723419.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55408999886.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/tomasatutifekuduzifuk.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/91863668378.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/14073524646.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/nebose.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/49580273957.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/47817664829.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/75922601956.pdfIn PDF document text
    • http://rc-modeller.se/images/file///51240617268.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/50418349545.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98840102953.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/47163861586.pdfIn PDF document text
    • https://medpressa.ru/files/file/marowafu.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/81285312402.pdfIn PDF document text
    • http://honda-vo.com/upload/file/4931610610.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/bawidigexemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=basic+science+for+class+7+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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 10620 bytes
SHA-256: 7179ca4b2dbb2476d530aa2687591b0b1a3771299077e7a97e65f84303fc8fb8
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 17964 bytes
SHA-256: 6d5d73e8e05df3ae4568505e160c1ebaeb6d011ec435c38802d919a510017a31
font_02_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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