Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9d99a61b3e09ba…

MALICIOUS

PDF

80.0 KB Created: 2021-04-06 22:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9bf39aaabd10efce8b04bf7715eb25e3 SHA-1: 7c90dcea8cef55fb6f0f8f4658f760981f8ae311 SHA-256: 7e9d99a61b3e09ba808fb066c4adfd552c420c183dcd84f233fe99fa3af72807
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms hosted on disposable domains or redirectors. The heuristic firings indicate that the PDF is designed to link to malicious infrastructure, likely for phishing or SEO spam. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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=rc+airplane+design+pdf In PDF document text
    • https://cdn.sqhk.co/gegefemorosu/hghP3ah/xibubijifamozefig.pdfIn PDF document text
    • https://cdn.sqhk.co/vokipidelad/ih7kiep/lagu_celengan_rindu_fiersa_cover.pdfIn PDF document text
    • http://options.expert/marble_ramp_lab_reporti4kl3.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/kobaladoxidipoperewonexuinp31.pdfIn PDF document text
    • http://koreatop.ru/16579024400tsa5p.pdfIn PDF document text
    • https://cdn.sqhk.co/pelonulu/d6n5jbJ/united_states_attorney_chattanooga.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/7gdgisj/iron_punch_game_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/P9gf3R6/classic_cars_for_sale_under_5000_dollars.pdfIn PDF document text
    • http://cmbespaceclient.xyz/mechanical_engineering_salary_per_month_in_ghanaj1fur.pdfIn PDF document text
    • http://lami-lashes.site/rewavanuvugitupadofapanixdh7nj.pdfIn PDF document text
    • http://psylath.com/black_swan_books_lexington_kymr2yr.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/hGgfgjX/26580753412.pdfIn PDF document text
    • http://nelezoroga.22web.org/82741599706.pdfIn PDF document text
    • http://musofiron.ru/always_know_what_to_sayotye6.pdfIn PDF document text
    • http://creditscoreusa.info/el_coronel_no_tiene_quien_le_escriba5tlts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_c9c19880fdfb4fd3bf9a050f1aa17beb.pdf?index=trueIn PDF document text
    • http://gofosuxubajo.epizy.com/jonafomajiwujolawifekaman.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_8a38402e38c44274b1be97c715121ec4.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_a33569f44b8c4d6093dc51a4f3a2b382.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_ab1e234748644d9da054c79b57c45c83.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_4e6e1b128002411a9df9596dcd9c8714.pdf?index=trueIn PDF document text
    • http://fedununa.epizy.com/assassination_rogue_4._3._4_pvp_guide.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_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 5328 bytes
SHA-256: a9c4a157cc022fab1338b1ba9c96b3869a094ad88d45e9226b08eb26c463912a
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10612 bytes
SHA-256: 3537c55b661464083a7d9f38d4cf979751f22dec930a656d4689460f2111ca60