Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fde05d6f28b35b…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 16:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3db53662060f81ac1327ab37f5206fa3 SHA-1: 94a112ba7deab9133ecad1b74d71045edf8e8e14 SHA-256: 44fde05d6f28b35bbbdd20f84fb29bc037d6ebc788aaa2fde2ef66be7afba8be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mezovuduw.ru/award?keyword=headway+elementary+third+edition+workbook+pdf PDF link annotation
    • http://pupunorip.getenjoyment.net/6806668468.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/gR6rj5f/vefubenilatixexisabep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_604676e98165f.pdfIn PDF document text
    • https://cdn.sqhk.co/rizavoxaje/Ehfjijg/history_of_nigeria_colonization.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5ff1af435746f.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/gimagaxexinemop.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/oracle_sql_certification_cost_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/SbeXjfQ/32626253512.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/c04cc887ff.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/tunomuvelubef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5ff4c368671f2.pdfIn PDF document text
    • https://xeligedijeka.weebly.com/uploads/1/3/1/0/131070237/takixopexunofo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453144/normal_5fed3ac56c24d.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/DL1Yyjd/cells_alive_internet_lesson_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/ggfjbUA/92232007175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fd91ee82c4da.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/a9fb8b024c9.pdfIn PDF document text
    • http://xelowonol.scienceontheweb.net/gramatica_para_aprender_ingles.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
    • https://s3.amazonaws.com/fizup/resewofatevuxewonewuxero.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/88844902478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b240aeb1-4cbf-4501-bd24-9d65870b5368/the_chronicles_of_narnia_prince_caspian_2008_full_movie_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc282c4a-c555-4180-be13-0a7b6e137504/mindfulness_coloring_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce0af08f-a03d-46d0-a771-d1190afa1534/87128338198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592741b8-00d5-43c6-a2a9-cb0264839354/12712834692.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/janid.pdfIn PDF document text
    • http://jupegojut.atwebpages.com/cell_block_tango_piano_sheet_music.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/curriculum_vitae_format_sri_lanka.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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 5252 bytes
SHA-256: 3cbd2c178505ed0a5986b575ed6ffaae43a0ade9bf12b014ae38e96451e8dfa2
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 10036 bytes
SHA-256: 31373da7b600efafe31abb326a1ecb539098b7d50ea044d9af12f1d6c79b95e1
font_02_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3