Malicious PDF — malware analysis report

Static analysis result for SHA-256 0976051685c8d3b0…

MALICIOUS

PDF

87.8 KB Created: 2021-09-09 03:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: faa202d7ad3334914140b466d7f09fb4 SHA-1: 41839619a6bea8f1a2236b5b2da5952d2b9a76fd SHA-256: 0976051685c8d3b0faff89a0d1f9b56fe84c98e5dca0a42712b791202b492328
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pomodorolennep.de/gfx/userfiles/files/93436952147.pdf In PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/71710046889.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/gaxojozelifax.pdfIn PDF document text
    • http://mylodge-naoshima.com/subudozisa.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pedowu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb71a04c83---nasivorinidat.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/giwavesavewoxikofitole.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/xijabegetivetolarivugata.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/11559275123.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abed10fb7---56106586836.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109060734362546.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/jivavup.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/logetobonenotusobejerunal.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/72461130022.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/42992085454.pdfIn PDF document text
    • https://kiptep.ru/file/zitobudadije.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/gebusopadixefakiji.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/pibedatexopuku.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/rumigajosidurapuf.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/nijosuxekawoz.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/44679667491.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/17368691202.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/21861739866.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/30128694599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=office+365+valid+product+keyPDF 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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 18584 bytes
SHA-256: 4f5e0c4fecdb128646974b94b857b8989ff4218af6b253697b94740d0ab45158
font_01_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 11212 bytes
SHA-256: dc77d93a01e5cbde0aecb5b1718c40e4b944eb459c1c54044a23fb075d2938bc
font_02_sfnt_off0001398b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1