Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc5583cfa292398…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 23:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7f063185fb9ff83f53d44d692bba9d0 SHA-1: 31d488acbd5301d53d9fc9df40e3b055dec3d853 SHA-256: 0fc5583cfa29239839366d1ba85432cd0c9bac53f6cbe5cde0fd3ec6bc9d26c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several external URLs were extracted, including one pointing to a raw IP address, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tifojidoxavumowux.pdf In PDF document text
    • http://gleb777.com/fck_upload/file/fufelimivutodozuretifa.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/bewerasoveguv.pdfIn PDF document text
    • http://pinxedien.net/upload/files/96119130927.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/zomapoxabukumujokigenogi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/96262223691.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/reviw.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613940ebdbd67---sobomegokebed.pdfIn PDF document text
    • http://medi-sen.com/files/files/35218914139.pdfIn PDF document text
    • http://trieuduong.com/images/Download/remeziwowanovoku.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/gukesimiwutapifevuz.pdfIn PDF document text
    • http://precisao.org/files/files/degifutikemipomesumagov.pdfIn PDF document text
    • http://cudicio.it/images/file/56292063532.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/mipesolunavuri.pdfIn PDF document text
    • http://princeverma.in/uploads/files/zipinerofigow.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/1552578743.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/lozukem.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614084b26dac8---suwaxeduwunoxiwuzagax.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/gavezelimo.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/54894160366.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/99847661909.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wojizexoxubupote.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sorovoj.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28491385218.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hack+hay+day+2021PDF 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_off0000dfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB4 10100 bytes
SHA-256: b31d0bf442f5386701407a7f87d2d3e78f659f68951460888aee45f624604051
font_01_sfnt_off0000f66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 19000 bytes
SHA-256: 386081acb4bf56d629dd67544963574aa454f42a7f21a9e90d69d953585c016e