Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7503fab0d485a7…

MALICIOUS

PDF

138.7 KB Created: 2021-03-16 09:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 484b66367929a4a880e10610b8ad6dba SHA-1: 8d51d371ac09b4aaf86dbf0a8c5b667a555b006b SHA-256: cd7503fab0d485a7ca731c53062efaca5724f2e98f2b336451f1cc34042fade5
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, such as 'https://fokemale.ru/award?keyword=escherichia+coli+classification+pdf' and 'http://visobuwulogej.22web.org/best_reader_windows_10_tablet.pdf', suggests a phishing or SEO poisoning campaign. Although no scripts were explicitly extracted, the PDF structure and link farm indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/award?keyword=escherichia+coli+classification+pdf PDF link annotation
    • http://visobuwulogej.22web.org/best_reader_windows_10_tablet.pdfIn PDF document text
    • http://vidoroxujo.22web.org/animate_logo_after_effects_template.pdfIn PDF document text
    • http://takavejesutep.iblogger.org/barbie_dream_house_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/pumefafenul/3jgKCFG/band_apple_watch_series_5.pdfIn PDF document text
    • http://piwulefimer.22web.org/gpo_outlook_2016_automatically_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/ihzquij/vajuzuxegawig.pdfIn PDF document text
    • https://cdn.sqhk.co/nufuwijili/KD7gc2v/bewepi.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/ejbXtTV/baby_phone_number_whatsapp_group_link.pdfIn PDF document text
    • http://gadokuzepot.22web.org/87712728763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_11d6398da02c48919ba1b32df1ffa7b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefipa/38185967893.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/nc_dmv_license_renewal_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/2010_cadillac_cts_v_performance_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/visezexujuj.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/what_is_a_ninjutsu_school.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_d5a27db8d9e347e080aae1ba7973fcfa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/interim_report_definition_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/information_about_computer_memory_card.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/bein_sports_live_streaming_free_apk.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_4c3849dc66524abc8dd79321b2660781.pdf?index=trueIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_2e230249f91349be8b24b183f3066e57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezebepit/lp_bblsr.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C79B 5200 bytes
SHA-256: 987f4a5b1fa5b9857187f74f2bb418647df72bea691bb6436428164636ea2587
font_01_sfnt_off0001d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D949 14340 bytes
SHA-256: 74ad74f0f06ad2d0e6addb9969268f36eeba1e61d137db8d45d344fbe46752e9
font_02_sfnt_off000207e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207E4 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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