Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af20cbfcbaf32e6…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 08:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d4e7c0c220caffe349a384acc686bde SHA-1: b41c541c994f8b0e134ced772c992d9dc979f833 SHA-256: 8af20cbfcbaf32e689b70d17cdab3aa6f8ebfc20daea98ff567b9dc2c1099f2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, suggesting an attempt to direct users to external malicious content. While no scripts were directly extracted, the PDF structure and the presence of numerous URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://bezagsecurity.cz/userfiles/82889001889.pdf In PDF document text
    • http://e-sportis.com/images/upload/55939797724.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/63282193992.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/wavisexadofogimezeper.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdfIn PDF document text
    • http://mylodge-naoshima.com/pajawanerekog.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/82367608667.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/85814527513.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/87819540989.pdfIn PDF document text
    • http://1careglobal.com/upload/files/98311381209.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/99138948034.pdfIn PDF document text
    • http://asid.rw/userfiles/file/3466521532.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/85023504570.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xuliwaditi.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/76092790207.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/72555804026.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece1feb577---gagulamekimosefivize.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jotivokadomojoxokupo.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/11143297778.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4e81b89---genizolub.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/bipafojixi.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/25113305618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mortal+kombat+11+apk+download+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_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 10616 bytes
SHA-256: 5c19bb83c39cc119e7dc3a71ca61f5b7abb9999e871a7c933d5ab0f3b9d69b31
font_02_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16604 bytes
SHA-256: f24c79f1da4f02222242f940877de6a758792d927e55d1ff30dd48905c192df1

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