Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40d8d4bf5557c44…

MALICIOUS

PDF

71.1 KB Created: 2021-09-22 12:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48ccfe246b7603272387ce1685106230 SHA-1: fad211ea597faef0c83f6959d50f07e505617d29 SHA-256: e40d8d4bf5557c44348a87d8f82bc986a7183d1ec67b6fc3e4d62104c602395e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://satybharat.com/ci/userfiles/files/xiradisunovifugoxodevike.pdf In PDF document text
    • http://www.gamylai.vn/uploads/files/44282831845.pdfIn PDF document text
    • http://islandpointfl.com/userimages/basudeziwolomupudomiko.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/tuvitunus.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/tedata.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82438400797.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/kevati.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/jujabaragepuraraf.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/7576860054.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/44784910912.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/ludanudamemafabem.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/lubem.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/xozete.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/garamolutipufagugirisax.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/morimurimugilivamuvu.pdfIn PDF document text
    • https://premium-house.uz/images/file/jovufof.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/lekelelexifixebo.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/davemosurox.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/96633904944.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/rekerisuminid.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/xafitetunewizasowajiwonog.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/51822033048.pdfIn PDF document text
    • http://fnathservices.com/upload/file/dubexileno.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0bf1c3054c740ed1765d51215b741952/56462912244.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/38314513054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=where+to+download+free+games+for+androidPDF 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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 10880 bytes
SHA-256: 122fc14a6f127c391abef7e7cae145d6b35483b2af32663a2e809f005ed052fc
font_02_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 14976 bytes
SHA-256: ce8f5b7d5c4707c7fe5c7f285fdbe8e628eb7eeec5c3e8654bbcab2ee07fa5cd