Malicious PDF — malware analysis report

Static analysis result for SHA-256 5099b3ebdeb3bbf9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 01:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3ecd4d8e70d8174033a53e5f34388b3 SHA-1: 2f268156d7af5c47b92941a1c65f47eea9e88fa9 SHA-256: 5099b3ebdeb3bbf99bc9fc44a0240a44d454ae0f906ccee3df61ef92a9091732
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. Multiple heuristics indicate the PDF acts as a link farm, directing users to various external websites, some hosted on disposable domains. The presence of embedded URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://catamma.ru/uplcv?utm_term=hotstar+vip+mod+apk+2020 PDF link annotation
    • http://thewellmanteam.com/userfiles/files/bojalejute.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/50568685514.pdfIn PDF document text
    • http://belv.ru/userfiles/file/toxega.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/90772541955.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/5290347131.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/ragebesete.pdfIn PDF document text
    • https://heureka-cz.eu/files/vabubopo.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/93202028103.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/31990597327.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/47690378649.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec67ba5b80---72505732513.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/39195646270.pdfPDF link annotation
    • https://associazionebriciole.it/public/file/xasatutusetoloxoxu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/94155098733.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/4127424443.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72976950358.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f3733818476b0ac373820343a104d1fe/nexedekijugodudagogado.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/63173796709.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/rosapadakuweb.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/tibagudoninawafedepesik.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/30810777464.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/kekokopek.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/sadapagumewuk.pdfIn PDF document text
    • http://ttc-investco.com/img/files/33828804969.pdfIn PDF document text
    • http://samtekelektrik.com/files/jupukufilugigunerof.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/25195494908.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/22079134635.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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10664 bytes
SHA-256: e3fc6d67c34aade66c4f680c1e1de4d37ffd185cb13a6dcdd557e77952d55c35
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 18848 bytes
SHA-256: e434c7e3ec1183a0dd46d72910be904a239cf67a83cd8fd8cd9567c670cb307c