Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a94b2957d6edf2…

MALICIOUS

PDF

80.4 KB Created: 2021-04-17 02:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3c67e3747d0b2673e8ae441b807aeeb3 SHA-1: 4852033a7e8bb90bacb3ba406014c0dc209e04d2 SHA-256: 80a94b2957d6edf29d93a91ebf533a66e691097875386a534001e8187e5de315
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=is+it+good+to+have+multiple+hobbies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408711/normal_605017e230c70.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/ha3hcjb/remix_maker_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/UWxMjdK/titifesizuzadaba.pdfIn PDF document text
    • http://reduslimitalia-official.site/calories_in_a_small_wendys_chili_with_cheeseyk2op.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/icgduyu/28418662848.pdfIn PDF document text
    • http://snail-case.store/kijotwwzw2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_6056c9885d04f.pdfIn PDF document text
    • http://xtreme-sport.ru/jiximorozigafofafmzde.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/aifigif/dell_alienware_area_51m_drivers.pdfIn PDF document text
    • https://cdn.sqhk.co/sekijebasazi/cuGQjhh/random_anime_character_generator_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/heFgeiY/led_control_box_12v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_60615d2402060.pdfIn PDF document text
    • http://freehookup.xyz/tekugezifejy34k1.pdfIn PDF document text
    • http://fastnoutservice.ru/oxford_dictionary_word_of_the_year_2018_hinditz2fm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460944/normal_5ff5777977bf4.pdfIn PDF document text
    • http://community-day.ru/what_is_the_purpose_of_an_expository_writing_piecef2bcu.pdfIn PDF document text
    • http://bit7.top/basic_sewing_patterns_bookcudod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fd223456b4e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/when_you_believe_music_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/60910173134.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/oral_b_replacement_heads_cross_action.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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5416 bytes
SHA-256: 9f16b024a61e7c4e89a9ca05b602e28bfec55487c5ca4e49382ebcbba7721d34
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 10472 bytes
SHA-256: 945c1dfa4cc1e36478847d6002a4de7df84c4c2bc10c6acb8f7890f5aee758bc
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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