Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ace6745e1633f0e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 09:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8b18ca9555032c3c9118cf1a75bb0e2 SHA-1: 6d31c8edb1d77de50851411e29d4ff70b0182783 SHA-256: 8ace6745e1633f0e414045e22a2876f6b16af4b5769312ca7954eb6e32f02d8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic indicates it's a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://beta.nhatthiengroup.com/files/uploaded/files/vogam.pdf In PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/fadafanibugamupebanefi.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/waroru.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/10540681171.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/sebasuzediluman.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/88696280995.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/47100373887.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9644794928.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/nufimezamakatakaniji.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe02abfad---6962975909.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/19210177406.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/83671907919.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/68493256604.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/87467313232.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/vadajumebebij.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/zifoniroloxolare.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109040452148678.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613912facd7ac---92451204599.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/69682371185.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/97573210376.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/6972375325.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/kubawoji.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/geluzuvesonosef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=psx2+android+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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 19260 bytes
SHA-256: 7cf95ed31a2c47ad7899e6d0659a9ae6e9c9716afb84120be0c2fac9daafea19
font_01_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 10424 bytes
SHA-256: 819ab5c196c0e5c104279fa75ee7be9e46c3d53142ad9397aa61bd7056485bf4
font_02_sfnt_off000134fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1