Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0002021388c20c…

MALICIOUS

PDF

132.1 KB Created: 2021-09-16 18:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19671feea9521b69e3d9aa15bd778508 SHA-1: ed772a3359130e9d43ef35b84894aa5d27d111a2 SHA-256: 4c0002021388c20c2a28bd3c9a66d39d8b104248090a123fd0f452bfeae3e649
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs further supports the attack pattern of directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=clash+of+hero+hack+version+download PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161382a2bddd45---pezabatidufabisuxiw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/7629736922.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/37386653959.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613da533ba6f2---dulidawavosez.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904183435734564.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/ferogujelirapamamu.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/girukisid.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/vuguweme.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/17952207042.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/zonidobirofawofapewines.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/97043485083.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/82322549748.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/88856388954.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613188c97c478---1434515071.pdfIn PDF document text
    • http://exima.kr/userData/board/file/mejufi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/losorebuviwiderepule.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jasodi.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/gesufaluza.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/serikodopojuverapatun.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/27311539456.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/9022556218.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/betipolosibetaj.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/94183152417.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_off0001a090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A2 18916 bytes
SHA-256: c74cdc2c114467d8df66af6b91e38da4e76cfa6c8e7228d5188dd4f1a0b452b8
font_02_sfnt_off0001e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9CE 10752 bytes
SHA-256: 641b2c64a231f40288c368724ef3b55b9bf6b9f4d547450903fedd2681011eda