Malicious PDF — malware analysis report

Static analysis result for SHA-256 323ddd9cfeeca76c…

MALICIOUS

PDF

83.3 KB Created: 2021-03-28 09:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1aae97dfd407b978f8bd5a99c2d94952 SHA-1: 002e625ff9a56079673a0f0222ac69a3a39aafc3 SHA-256: 323ddd9cfeeca76c0d5efc0596aa8493ac7255122f8e84a1b6e2641c3d978240
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://crophysi.ru/award?keyword=problem+solving+in+mathematics+pdf In PDF document text
    • https://cdn.sqhk.co/jututumogu/ihGBgdL/metal_slug_attack_regular_army_units.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/fzjhLjg/35101301426.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/xefuk.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/encuesta_habitos_alimenticios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ff98be8a22b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_602a39f8e75d2.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/89206947261f8t2c.pdfIn PDF document text
    • http://ranking-se.com/how_to_reset_a_washing_machine_indesitxjegj.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/bilusujapizemesib.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/gifPdjf/uefa_champions_league_2019_final_girl.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/how_to_replace_batteries_in_xfinity_remote_control.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/S08aox9/zuxaromipasikot.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/bourree_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/89Djbhd/diy_personal_diary_ideas_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/jhGighf/furious_road_movie_2018_cast.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/physics_formulas_for_neet_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/p5hb9VK/cat_jump_starter_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/diwelamu/IidxLia/internet_download_manager_for_mac_free_crack.pdfIn PDF document text
    • http://helper-badges.com/snow_white_with_the_red_hair_episode_2_facebook20k62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://negumigimewote.onlinewebshop.net/25806030130.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 5556 bytes
SHA-256: 2189431d909070b5a1cedb3c542e8fc7cdadc344b52cfdccca22019304e7d8a4
font_01_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10876 bytes
SHA-256: b715d9bba0e42395d3a5fe9ae00210541d0f24821cca0fdf1c60eb64d4d4deac
font_02_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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