Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c1afcbcec83f15…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 05:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b69f420b95436a110a4483e1ac5362f6 SHA-1: 98f571064e563615d8a17eed9a1ba8042e0d8abc SHA-256: 90c1afcbcec83f15f2aaf1e60aef5f677fe481d40630fc2102217ea1fa122fbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious file downloads, and is described as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://abwingsjanaf.com/uploads/files/55934854787.pdf In PDF document text
    • http://progettogeometra.it/userfiles/files/96154136928.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210908152741512.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/27238225413.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/ribunonaguzugi.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/49066277834.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/69450772794.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/dunisu.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lodepupibogexetow.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef23e5fc7---60761112450.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/palejijuwosatiraje.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/36453420105.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/11721660132.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/fixejiseninujapakizipofe.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631124231.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zusajedasawuzusiwiwon.pdfIn PDF document text
    • https://mimpishio.com/contents/files/kudegesovaxutufebusova.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/dufesesosiximurajefak.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/soduzubosetifamevagobo.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/pexezu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11806338497.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/ludotukukujitowirup.pdfIn PDF document text
    • http://harlit.com/upfiles/file/67436387868In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=gb+instagram+apk+old+versionPDF 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_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 11072 bytes
SHA-256: cd10472bae25e56ed06622da3282911c47d0c92773e1401de925bc3fabcec51a
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 18880 bytes
SHA-256: e30ffdd3d615f7819a0e17b25398f8a8cc9e9fa7824ebb06e8514f6c425585b7

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