Malicious PDF — malware analysis report

Static analysis result for SHA-256 91738e276c036267…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 20:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3cead4a34bd51fb7b1023ad756348847 SHA-1: d4c9447ab3a2120bf1741442bead4a0289908aa9 SHA-256: 91738e276c03626746484ad8869703a8ef3962fc03cb9dc1ba089af1df937686
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or SEO scam. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious intent, likely related to driving traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://bologen.ru/award?keyword=year+7+algebra+questions+and+answers+pdf PDF link annotation
    • http://debegezuvume.iblogger.org/52_week_money_challenge_50000.pdfIn PDF document text
    • http://topvideo.design/eye_doctor_excuse_note_templatelayns.pdfIn PDF document text
    • http://sparzha.club/wexiniwutobuzagafaxas9g6g.pdfIn PDF document text
    • https://pogusunuj.weebly.com/uploads/1/3/4/8/134874329/eab00.pdfIn PDF document text
    • https://tazabavirivagi.weebly.com/uploads/1/3/0/8/130814173/ximazuzedoxukawumu.pdfIn PDF document text
    • http://pepufur.22web.org/video_er_professional_para_opera.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/livro_como_falar_em_publico_izidoroh817i.pdfIn PDF document text
    • http://megalit-korolev.ru/python_dictionary_contains_duplicate_keys94zpd.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/fisozabevoku.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/3905036.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6304000b-59c2-410e-985e-1e1d6eec41f5/mokejifafifaduxokaxagapa.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/fb_messenger_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/tactics_for_listening_basic_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/forgotten_realms_map_5e.pdfIn PDF document text
    • http://donafilozevore.rf.gd/tukuvasoginogarugupisanag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c18c1cd-df01-47b1-9f69-915d86327bc3/mein_kampf_english_word_translate.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/ihip_side_swipe_bluetooth_headphones_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/bizijadirakofusokir.pdfIn PDF document text
    • http://tagugatukosag.epizy.com/mortgage_budget_planner.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/fragile_x_syndrome_ielts_reading_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/92486131950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa24464-8955-4a4c-854d-74fc01d5a952/craftsman_v20_2-in_18-gauge_brad_nailer_manual.pdfIn PDF document text
    • http://xugivazule.rf.gd/fantastic_beasts_and_where_to_find_them_film_3.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/jinulisaxisevozukebale.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_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5608 bytes
SHA-256: 4218c5190471011503fa3ad0240887bb669548f3d0e20e4d1e82af6980fc07e8
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10732 bytes
SHA-256: e18b2a3b6f339a259eceb82ff37aafaf1cc4e22823a7d8899e01c8dfe3790d38

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