Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb390fcd4b931ebd…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 18:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b1ae76ab45829fc8dd7cea481f48ef96 SHA-1: f2a502b4a3e041fd9ea6c978a4a123184a165eb1 SHA-256: eb390fcd4b931ebd7273cc805aec8a748eaf065d159eb8e0d87d00f34a220d1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with critical and high severity firings. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many hosted on disposable domains, suggests a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using link farms on disposable hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=the+bible+verse+in+pulp+fiction PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed300302a6---4046939669.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/89641550086.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021981637227964.pdfIn PDF document text
    • http://aromata.ru/upload/files/jimaj.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/edc7664efd1b422caa0bcb759b61069e/bokugatosonabavazalup.pdfIn PDF document text
    • http://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/sodibupevekulalumiwava.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/8585237559.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/lejutajo.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/89185625609.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/73256192953.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/falugak.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/xuxowikisaturofa.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/puxub.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/gaxop.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/24137493781.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waxilupenonijewozerilif.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/15822887835.pdfIn PDF document text
    • http://henca.com/files/details/file/25322731947.pdfIn PDF document text
    • http://vhshf.de/File/58763578970.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/xawivixavawipotowarexon.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/25573829403.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210904184848.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/nogeripigezufuvemejexeni.pdfIn PDF document text
    • 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_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10684 bytes
SHA-256: c97bd8827934ff992c4e5830ca8af6dd21e9f1b56be61482c39b37fc9273bac6
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 17372 bytes
SHA-256: 616d2c79f0099f44dbbaacb58033361632872c554acc23fb4bcab19cbacabcfd