Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1478cd6494629bd…

MALICIOUS

PDF

93.9 KB Created: 2021-09-20 15:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0664755426aa8bd673f5723e6e1a4d8 SHA-1: ccf5b9956cbf7a667b22c12ed8ee0ebe7f6d7ac6 SHA-256: c1478cd6494629bd11ac6d5691fe84e15da3fc3c3512b17a2d608edbd20da5b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a link farm tactic, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rqis5gmkuab8v7i2j7no1gabq7/46028316122.pdf In PDF document text
    • http://whatdwellswithin.com/file/71461158626.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/wodidu.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/36168937607.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/derekavavotimajuxugofef.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569c842e74---8871352945.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/xafuwodasujowenelifadi.pdfIn PDF document text
    • https://bak.vn/upload/files/64136109125.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/84391226378.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/13875428797.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/49475465653.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/40207463918.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/94779282615.pdfIn PDF document text
    • http://friulanapanini.com/images/file/girufilaxopataw.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/65912656976.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/59326277000.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/futapixigafowor.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/91068004103.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/fofisukojuzo.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/98194763073.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/debirogi.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/tokuvazanosu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/nurorimekulojumigel.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/23157611737.pdfIn PDF document text
    • https://31app.com/userfiles/file/87754019253.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/47343696784.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/20390218021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+english+movies+app+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 17356 bytes
SHA-256: 93bff00cf4b1d393f0acb4e142f769921088633a4f474852eb1195ea33d0b8ee
font_01_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 17936 bytes
SHA-256: 69dce2cf78e2819da930a4248b16c73df8a8f40a7365dc6d378edd7443365103
font_02_sfnt_off000138aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000150c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C1 10892 bytes
SHA-256: 0c9b57b053462c0d2e2faf35f1c6d16267c253312e074be4701a79644b760410