Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf33d34831a51f7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 07:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f50895cee400b4bf44b34910d9aecba3 SHA-1: 349c198f3196da2520be3d8c8657df841770e03f SHA-256: 9cf33d34831a51f7e1cff5175433d59c2b8bd1c96466832518110bb9f97f0f8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely attempting to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=shadow+fight+2+vip+all+boss+hack+download PDF link annotation
    • https://liftsystems.ro/LiftFiles/file/70544818832.pdfIn PDF document text
    • http://strahyi.ru/images/file/suboxexukot.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/nawifogoze.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/11274613830.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/viketosepedusamozobe.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/10668707559.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/89304983348.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/gajapalelejoxapep.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/wasebevopixeja.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/kiwogemuzugudaz.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/27942353935.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/65948168646.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/gefolomabave.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/17156134583.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/31783124863.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/88489085723.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/veboxorukovudi.pdfIn PDF document text
    • http://rsst77.ru/upload/files/23349509593.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210905_37B6C2A09F48DEA2.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/51991866918.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/96351153797.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/54892784279.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/5879247368.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 11244 bytes
SHA-256: 7ef2bf4e6f0dbcb479e48b7be0dc38b2ea5702b4cc897f6c71760e1b13026e35
font_01_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 17660 bytes
SHA-256: ec708b06f1605ac83b676eb21b79f1bd7ef540125c57c2ffb5164ca96dedee17
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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