Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bbe51236d5f547…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 16:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eb54889f35334b08fdf1d8d69ad4a8f3 SHA-1: 02d1b61f1a8745c11403cc2ad23c4e0ff9104b2b SHA-256: 21bbe51236d5f547aa2b5fa49d726c03bbabc9a76c818936af2197fc03cfea38
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily corrupted, contains fragments suggesting it is disguised as a technical document to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/aws?utm_term=introduction+to+matlab+for+engineers+3rd+edition+solutions+pdf PDF link annotation
    • http://rafale.store/jujumakanezijifajifekomiktgxj.pdfIn PDF document text
    • https://cdn.sqhk.co/remimuroku/hgcfvBd/saxegonepijubifibotelami.pdfIn PDF document text
    • http://purpless.vip/zadojanoruwotere3dl56.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/Zhaifhf/34753418701.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/hhgjkij/north_star_mall_hours_black_friday.pdfIn PDF document text
    • http://milanomoda-italy.site/54425449049gwk7r.pdfIn PDF document text
    • http://supermagazforsale1.xyz/ximapikagikugopss869.pdfIn PDF document text
    • http://esclick.pro/digital_design_morris_mano_5th_edition_solutions_free_downloadmm6lg.pdfIn PDF document text
    • http://reduslim-europa.site/what_is_the_book_code_talker_abouthyq8e.pdfIn PDF document text
    • http://moresukko.ru/how_much_is_mk_watche6hao.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/ii1lOvZ/32503552201.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/tosevud/farerafunokowa.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_04b39d804d4c4bbebbb7f974276155c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/669bc286-41b4-4a7f-8bdf-c7a985e2ca48/12990411174.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_a76cd25a16e84fd581a03ba00d1b1ba0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33de029e-0bd7-46b7-98f0-1429fc01aecf/how_to_make_a_low_sodium_taco_seasoning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e937b238-a9ae-41dc-a100-f0be23160fff/best_app_for_studying_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/advaita_vedanta_books_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/56016173245.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/angel_eyes_raghav_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/tuworo.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 5716 bytes
SHA-256: e644dc828c61d230d276d6d000b96288781e712863ea9b8bfc78617c248f162c
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10724 bytes
SHA-256: 8a157083df6db5343ee987aec0c7529c28af8f1d8ad64a525d1877c667b3de08

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