Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56939a25eb92230…

MALICIOUS

PDF

75.5 KB Created: 2021-09-22 20:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50526fc414611a801bfa59b42f0e8712 SHA-1: c8fdc5e4753841cf907dbe104d16dfe04b89bb8f SHA-256: d56939a25eb9223030188c1416a59540366c2fb92d9ecd3bc70a263d80a003d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hostsolutions.ro/app/webroot/files/userfiles/files/9693177783.pdf In PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/fabezetinadirege.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/21113227428.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/83361067442.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/65360298989.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/83577979774.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/koxebuluw.pdfIn PDF document text
    • http://hla.vn/upload/files/64791179318.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/sezenor.pdfIn PDF document text
    • https://majubesar.net/contents/files/zezaxelega.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/xifusekenodexorovi.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/65459853638.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/74739727025.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/55061957397.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/banelazunagojurosufizo.pdfIn PDF document text
    • https://ottopianos.nl/files/gomediguwuj.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f86fc59ec---48442840857.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6792c22a---51336989991.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/30341548155.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/64083052323.pdfIn PDF document text
    • https://777mto.com/contents/files/labosegufujakonofobizixif.pdfIn PDF document text
    • http://klinok-saintp.ru/files/tudufanerodun.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/73350667100.pdfIn PDF document text
    • http://live-net.it/file/87457909583.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/60892721146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+not+connecting+to+mobile+networkPDF 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_off0000c1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B8 10680 bytes
SHA-256: 3e2f2d390879fe82000274ae408fba5d990f0e98b1e24c8d00080e42880bc94d
font_01_sfnt_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 17600 bytes
SHA-256: 1c051be7c91027513e0f5e068cecc774e9c9fe90c8e8acc532bbf7c3193e895a
font_02_sfnt_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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