Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cd3f90a0bd764d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 05:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 697effead9ca19e57962a6b85849e2f2 SHA-1: f6af7a3a33701ae802be2167ded524f74995b1ba SHA-256: a0cd3f90a0bd764d50847d27a6d26a810cf71241fc005b6e3bd59adaf2b764c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to numerous other PDF files hosted on disposable domains. This suggests a phishing or malware distribution campaign, likely aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/pulapajuruwegagigepuw.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/soxinumakadul.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/dipuni.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/pokijufirunasopinesigikur.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7cbc8e83---86535218821.pdfIn PDF document text
    • http://hasyo.net/files/file/1743319852.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210921_C2B3081851BA5D96.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210903090302.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/51121984494.pdfIn PDF document text
    • https://satesayap.com/contents/files/43773060760.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/96275686281.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnva3h3i9hsklr918b656nl7cu/92631700762.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/liwosogibulog.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/24326042410.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/97923500269.pdfIn PDF document text
    • https://anfauglir.com/images/file/45885381947.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/94271183017.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/96122179023.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/lenotoxalur.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/51830952930.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/daxemakimi.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210901_4A8BE2845100C716.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jenes.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/wafaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=using+office+on+chromebookPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10716 bytes
SHA-256: 2b888c27b196ca04defcfff6b63ad28d3460aa5fa50024bfb938dc2d1423da13
font_01_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 17208 bytes
SHA-256: 124c5ea17e36bfcec4aacfaea9bb40823908cb59a73d377efbd1b3af47d86238