Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2d505ed9073c8f…

MALICIOUS

PDF

87.3 KB Created: 2021-05-20 03:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c715a398a699cf983e0db23899bfd7 SHA-1: 28c234d94a9ca3617c08fc5ae8b5e6a52c29c88d SHA-256: de2d505ed9073c8fe9c9000178e1fa78976d05dc75bdf90284e866cc3df19040
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are disguised as book downloads, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these links, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary malicious URL identified is 'https://jacksth.ru/strik', which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=the+prophecies+nostradamus+book+pdf+free+download
    • https://cdn-cms.f-static.net/uploads/4391340/normal_5fd81e9d36dbd.pdf
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/8207807.pdf
    • https://cdn-cms.f-static.net/uploads/4420765/normal_600e7af20c14f.pdf
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/6039335.pdf
    • https://sunupukub.weebly.com/uploads/1/3/5/3/135319403/tibavi_marapadopumepa_lasuf_luzokakuxex.pdf
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fd6630524dee.pdf
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/d6b9c0917894f8b.pdf
    • https://cdn-cms.f-static.net/uploads/4488822/normal_6041db3f97d1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/16d13ab5-3e66-4860-b699-c71d352780a4/animal_farm_book_chapter_2.pdf
    • https://s3.amazonaws.com/tesapibebujep/13430828440.pdf
    • https://s3.amazonaws.com/winumigutam/los_cinco_lenguajes_del_amor_test_para_esposos.pdf
    • https://s3.amazonaws.com/wexoteluwag/soda_stream_gas_refill_melbourne.pdf
    • https://s3.amazonaws.com/desekusoxi/kuk_university_date_sheet_2018_3rd_sem.pdf
    • https://uploads.strikinglycdn.com/files/b65d5106-5eb0-411b-857f-40f6070a9135/wovoruxigobudugozimir.pdf
    • https://s3.amazonaws.com/zerepuzuze/2723278540.pdf
    • https://s3.amazonaws.com/divikufifir/battlefield_1_game_for_pc.pdf
    • https://s3.amazonaws.com/rekawexuretowo/transportation_worksheet_for_nursery.pdf
    • https://s3.amazonaws.com/tomamujuf/whirlpool_self_cleaning_stainless_steel_bottom_load_water_cooler_costco.pdf
    • https://s3.amazonaws.com/jobavo/bodoni_72_oldstyle_book_font.pdf
    • https://s3.amazonaws.com/lofese/52415978452.pdf
    • https://s3.amazonaws.com/nerugiraxura/dnd_5e_death_domain_cleric_build.pdf
    • https://s3.amazonaws.com/mevuzokekenojab/19231167902.pdf
    • https://s3.amazonaws.com/gavobawum/alienware_m15x_cpu_upgrade_guide.pdf
    • https://s3.amazonaws.com/gogoxowiniza/biotransformation_of_hydrocarbon.pdf
    • https://s3.amazonaws.com/xakajoziwibi/75487622835.pdf
    • https://uploads.strikinglycdn.com/files/26b73b4c-e962-4252-805b-4a88770b64fb/instant_pot_indian_recipes_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010861.bin
87ac9a02fe358315af70fdfcdb1fff058f15eaa9da6336d6eb936d2f13b6aeb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 5524 bytes
font_01_sfnt_off00011b00.bin
4826afa1b63a2f18d1e6a929b959d77451705d20bfb9cb1552c7a2f03e444327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 11244 bytes
font_02_sfnt_off00014126.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 4324 bytes

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