Malicious PDF — malware analysis report

Static analysis result for SHA-256 af41c2e0fa410020…

MALICIOUS

PDF

89.3 KB Created: 2021-03-20 15:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 55fd52219459672703a50473bd7778af SHA-1: b18ac70b915675bd2cb1bb23df9269544cc5a670 SHA-256: af41c2e0fa4100200dfcf6cc359c24fb9fcfd3a3489f3b9a9034c117c43ff3c4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The 'high' severity heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates that an image lure is used to redirect the user to the malicious URL https://mezovuduw.ru/award?keyword=capacitor+types+and+their+uses+pdf, disguised as a free download. The document body, though heavily obfuscated, contains text related to the lure. No scripts were extracted, but the presence of external links and the phishing lure strongly suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/award?keyword=capacitor+types+and+their+uses+pdf PDF link annotation
    • https://cdn.sqhk.co/fedelubu/Cjehbjj/wosemovijoniwutu.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/cgeFidI/fegowapomubefumeba.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/ihiaeL0/prepositions_of_time_worksheets_elementary.pdfIn PDF document text
    • http://zorebagexibakom.22web.org/52730221131.pdfIn PDF document text
    • http://nawaborunu.iblogger.org/funirikutolodulosisip.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/gdjaxhf/open_camera_online.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/ihgiLhj/hide_and_seek_skin_mcpe.pdfIn PDF document text
    • http://xufozelit.iblogger.org/tusafun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizedumi/whatsapp_backup_to_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/gizokukej.pdfIn PDF document text
    • http://zenujasope.epizy.com/18007434229.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/mibubumidim.pdfIn PDF document text
    • http://pikididubemet.epizy.com/adhurs_comedy_scenes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/51762724685.pdfIn PDF document text
    • http://nivefozug.rf.gd/40542291064.pdfIn PDF document text
    • http://rakulewozagax.rf.gd/employee_provident_fund_form_13.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/42330891088.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/application_for_correction_of_marksheet_in_university.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/xifadusesagukonigawax.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/hepatitis_b_virus_treatment_guidelines.pdfIn PDF document text
    • http://mitoxewer.epizy.com/47251278399.pdfIn PDF document text
    • http://laxuzakefojo.epizy.com/81517902663.pdfIn PDF document text
    • http://jefelaxe.epizy.com/osi_reference_model_and_tcp_ip_model.pdfIn PDF document text
    • http://jurepofopu.rf.gd/vemofufilip.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://scripts.sil.org/OFLIn 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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 6952 bytes
SHA-256: 517c22dd4daffab682a5987ff4248171c1ca0b8cdba2bda5801dc204c04c3593
font_01_sfnt_off00010bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC0 5220 bytes
SHA-256: f889f22bc292a6585be3546135d90a95e316e25705c4f74a79798a389006f7d3
font_02_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10624 bytes
SHA-256: 5b4b5a239babffb8b9b8c3357c7b9efb8ef38441d90d3b9b0d92ce0e5ca4e642
font_03_sfnt_off000141d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 16116 bytes
SHA-256: d7b44821a274b198650e478dfa15a3f6921d7a5f043aef9c433e5d3a9ddccc75