Malicious PDF — malware analysis report

Static analysis result for SHA-256 103c2832114f9a7d…

MALICIOUS

PDF

96.7 KB Created: 2021-09-13 19:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abaadc1f3485adfa1d7c8367052d6a13 SHA-1: 1c59243410458f2faab8f2d47580a6c47015bfd2 SHA-256: 103c2832114f9a7d63f209b21b50e060d87a2e891e780bf16a6fee0adee3d3b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the overall structure and URL findings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=mp4mania+movies+download PDF link annotation
    • https://cepatdaftargroup2.com/contents/files/regijamiraturetopokegatuv.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/28404081232.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/xotizepibefidojusepiw.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/66441095652.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/93499025540.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/37294457695.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wezazebuxiwifo.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/debafezuwo.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/44386671922.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/pamogowutu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb4d25356f---fivezowumakizovarubalute.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/winoxupu.pdfIn PDF document text
    • https://basisnomor.com/contents/files/10355425952.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/lovutulifoveja.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91992373619.pdfIn PDF document text
    • http://sinners-party.de/media/file/zedebodaduripobisosul.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/15746926683.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/zuvizebuwimowizuti.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tawofet.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/66004976663.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/23780806516.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/xatarebobido.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/39607388087.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mapoxubifaxuniduzoraxi.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/nimudipilurezonepowe.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_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 17460 bytes
SHA-256: 77d9cf5e7274f84a0cf4a0b61eaac43ccd4b841573201d9c510733a13b0bcbd4
font_01_sfnt_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D48 10580 bytes
SHA-256: 5152fc172f850a0e8f4447bd2c1fc2dcab0719596099c50b85dcbe1b321ece9e