Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a05a90635e55157…

MALICIOUS

PDF

111.1 KB Created: 2021-03-29 05:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0b5d1d5e58e9115194a19217f45d618f SHA-1: 5ebc03fa57dbcda7f62e4959951ce19f8c529ce1 SHA-256: 7a05a90635e551578ee91279faaf41ac65e555a16861f8f8e0e7b54e4f0f8393
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=livro+can+t+hurt+me+em+portugues+pdf PDF link annotation
    • http://rubewox.sportsontheweb.net/crochet_throw_patterns_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/Qje6hiC/tezojedibifizo.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/brugge_walking_tour_map.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/8FuhUiJ/49301866273.pdfIn PDF document text
    • https://cdn.sqhk.co/leperanurosi/jjbSjba/56478591757.pdfIn PDF document text
    • https://cdn.sqhk.co/fefowofuk/cicpfje/redcon1_movie_budget.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/what_is_qualitative_research_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/lipetebo/ebPibiI/games_cheat_codes_gta_5_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gesokusa/hiT8ib0/disney_sorcerer_s_arena_tier_list_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/Chjwihi/zudixenorudoxipixorubesus.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/hfLifhf/rolling_stones_song_lyrics_paint_it_black.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/eidhb04/63335693409.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/aBWhdge/download_idle_makeover_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/kudozaporuro/hfZB7ge/lining_sonic_boom_2020_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pareruwawetis.rf.gd/configuration_boite_mail_free_android.pdfIn PDF document text
    • http://fokafupu.rf.gd/72709774463.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/74521110693.pdfIn PDF document text
    • http://murapimopavopa.myartsonline.com/16291873930.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/70123721765.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/computer_hacking_books_in_hindi_free_download.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_off00017450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17450 5536 bytes
SHA-256: 1ea216796b036cfa45122cb83ea7a7bea9883ab6a9c62d85ba436c04e12a32a5
font_01_sfnt_off00018709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18709 13264 bytes
SHA-256: 85661365009121d06e028a8b9f4d20901a3f888f679e96a6ea8ca8584700488e

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