Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b0ea092d519998…

MALICIOUS

PDF

95.3 KB Created: 2021-09-11 21:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d436bd16fa677ecc32974d7aecdaf4cc SHA-1: dfee250b2719cbec5ec4c64099333562c5496f69 SHA-256: c2b0ea092d519998595f8ddb879e5283dc6d3a1729aae688bf7efc0b07f21197
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://transmar.biz/ckfinder/userfiles/files/44869697288.pdf In PDF document text
    • http://manenshop.com/upload/files/veduter.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/175061236130e65e14797.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/99095455765.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/solutuludajosikaxos.pdfIn PDF document text
    • https://podimercrm.com/img/files/13506934686.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/72749989831.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/sevalek.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/7296726357.pdfIn PDF document text
    • http://one9five.com/userfiles/files/68310328952.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xoxirat.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tetujoseseg.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/vogeb.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/rawenebevewiwodudelokede.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/wuxujisojogufinage.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/koxadubutare.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/bepubumowutikotiwiru.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e1fd8c21330e9b85045c4f9a45bba9c4/93418904126.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134500ca2e60---95294465664.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/35428841273.pdfIn PDF document text
    • https://mavibusiness.it/file/jedigobabefipo.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/tavamiwovabaz.pdfIn PDF document text
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/61920999068.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94362025454.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/rofavumixixanarofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=little+women+streamingPDF 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_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10492 bytes
SHA-256: 88964ad77504dd0d7755e753946a9b892679d4da4b4f58e692b82753fbe9b46d
font_02_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 18544 bytes
SHA-256: 696fc8d6761d8fcf32c84332a383892d1f415a22c4d657b1cd2722d785139992