Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63090e4300ebc72…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 10:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1138b5802518ab722e502e80834f0dc8 SHA-1: 8a6aa5d35286d8d3df89186b04fb5f0429387d8e SHA-256: c63090e4300ebc72e3fad71be5df0509cc6c679eebfaa4938cf013c30ad997a2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05483e6ff---71232327836.pdf In PDF document text
    • https://sharjahcements.com/images/bulk_images/files/rerapiloxenaxu.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/87532928830.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/lowemuf.pdfIn PDF document text
    • http://unsersohn.com/images/file/47924091960.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/68569164785.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/37b43e63de2423bf4b8e017e3fc435c5/xumurorivejironefoxusuni.pdfIn PDF document text
    • http://showdoimovel.com/files/files/lepemuko.pdfIn PDF document text
    • http://usmleworkout.com/files/file/rafipebuv.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/35949122119.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/14370162393.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gutufimaborivapesuz.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/rafedud.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/xegovuzitagovidizevelis.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/10139095642.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/wosepowex.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/35077392798.pdfIn PDF document text
    • http://aquatherm-graz.at/files/kepevovaxupifutem.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/zajanifadudino.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/dijiluxitadodami.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/20/34404795734.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/labojifafukikujis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=game+killer+apk+downloadPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/23471097550.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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 18044 bytes
SHA-256: c78a669e692f632eef3b26ad5a4f164dc7cd954fb1c7e881a4c749f16eca0bfe
font_02_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 10504 bytes
SHA-256: e08db2a60d7c5d91db064a05e00b134af505b753c9929d52abe8287542dca992

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