Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55b5c58c04f2077…

MALICIOUS

PDF

75.1 KB Created: 2021-04-02 05:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 58dc5f54097735751b7bb9c828a9ab4f SHA-1: 19ddb42c3fd674ba53049615e6ed26cd58487f44 SHA-256: a55b5c58c04f207775287314b90335184454f109d2fcf95e2863a810752b79a3
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a very high probability of maliciousness. The embedded URLs suggest a phishing or scam lure, likely attempting to trick users into visiting potentially harmful sites by disguising them as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=introduction+to+c+programming+pdf+notes In PDF document text
    • https://cdn.sqhk.co/naxupowu/bXLVgiX/blow_molding_design_guide_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/hf3hRqs/honda_gx160_engine_workshop_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fe0f0935d71a.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/Egdgjig/97885307601.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/JxjRsid/fish_tank_video_youtube.pdfIn PDF document text
    • http://kuzaduxojotijid.22web.org/zobebemizoxokikubogi.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/ojejjOw/run_fast_run_far_big_bang_theory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453540/normal_5fef9275c7940.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/un99ieL/80496762821.pdfIn PDF document text
    • https://cdn.sqhk.co/dasewugiru/UT34hdi/wefabenepalex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_604fe67695812.pdfIn PDF document text
    • http://xowozumevabig.66ghz.com/address_format_letter_usa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fcd3647f22ef.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/ib6hfCO/11547498038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6037d3255798b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuburojirep.epizy.com/94087100805.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/conair_handheld_garment_steamer_instructions.pdfIn PDF document text
    • http://lerapavuzuloz.epizy.com/5562631278.pdfIn PDF document text
    • http://fijoramobizedej.epizy.com/jojefin.pdfIn PDF document text
    • http://nezeseg.epizy.com/petete.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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 5380 bytes
SHA-256: 037ac5216d2af6793f3c71edbc4dc76dececd2c3441d63e76e00b1a5d95fbd07
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 11236 bytes
SHA-256: f2d652a4f97180c31359e41c38fd51c4cadb8ef7f75e799e9e6139eaf34241a9

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