Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d120cda822dcc6…

MALICIOUS

PDF

86.0 KB Created: 2021-04-02 20:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 657c76d929b5ab48686be8b05c84ab1c SHA-1: 7055eba2a35ba2107090f61f891ea69429e4a2f0 SHA-256: 65d120cda822dcc6a6dac08f6c5c9f7eb17cb2520f2c4caf5adc0c7459088fc6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://zajinet.ru/strik?utm_term=autozone+employee+transfer+policy PDF link annotation
    • http://study-english-05.site/easy_80s_music_quiz_questions_and_answerswasf9.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/sowesadumeripibugok.pdfIn PDF document text
    • http://cmb-societe.com/motorola_apx_7000_antenna9sxs9.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/cheat_codes_for_gta_vice_city_download.pdfIn PDF document text
    • http://winfreeiphone.xyz/does_nespresso_work_with_k_cupsc9ehb.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/45c28f8af1639.pdfIn PDF document text
    • http://jakartapro.xyz/libro_el_juego_de_la_vida_y_como_jugarloh7dkb.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/data_analysis_report_example.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/vesewefedetunejigafiji.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/biwudifupugaka-tigodo-xoremitenana-pevometis.pdfIn PDF document text
    • https://pejejuwefosewa.weebly.com/uploads/1/3/4/0/134040570/8155660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_727243fd92f24b788ee04f26643518b1.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_c68f860ccca048d1a3dc9cfd41760833.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/hoover_power_scrub_deluxe_carpet_cleaner_with_tools_fh50150_reviews.pdfIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_b52e56bb4da3468aadf7c92a6aa52304.pdf?index=trueIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/what_is_meant_by_habitat_and_ecological_niche.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/film_devotional_songs_tamil_free.pdfIn PDF document text
    • http://vekabun.myartsonline.com/basel_ii_summary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 5304 bytes
SHA-256: efec835caa5a212e52ae12e9dcfaa7b8dfc83c3d55a79b257186a1d198a86dcc
font_01_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 10740 bytes
SHA-256: 2f31e8a2b75b859eb138ac79de2c1adc0d9a8d1635d1c94ee49d34f43d63ab12
font_02_sfnt_off000135a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A1 16060 bytes
SHA-256: 3588d78da3bcce162b7a515e0f24731007aead24a51c4169b4f8f584ddd91517