Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7576fc4615aba2a…

MALICIOUS

PDF

75.2 KB Created: 2021-04-26 17:40:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: aa90836aa497e729479d4f47e9967ff5 SHA-1: f1239caec1db2bc91764be8e2cb09ce1511f588e SHA-256: f7576fc4615aba2a49de83643b4b4a4ae9e62a3a82520e4d113b2fe5da623d7e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=new+catholic+encyclopedia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fe600cd366aa.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/add_text_to_adobe_acrobat_reader.pdfIn PDF document text
    • http://figuxovutofid.mygamesonline.org/what_is_righteousness_according_to_the_bible.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/web_application_architecture_principles_protocols_and_practices.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_6008b5d8d6cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_604adc1730e61.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/dTjgHtB/gunerif.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/jhi2ifM/transgender_surgery_video_youtube.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/93731143651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504922/normal_5ffe440e3d1f8.pdfIn PDF document text
    • https://cdn.sqhk.co/bitajububida/hHajghN/febeg.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/Z1hWVhe/elsword_add_dungeon_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/Xje7Yba/rirozedapoxegofa.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/aghdiir/hask_hollywood_picture_quiz_answers_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/jihiidU/novip.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/de_que_se_trata_la_obra_cien_aos_de_soledad_resumen.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/27240135805.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/atharva_veda_sanskrit_english.pdfIn PDF document text
    • http://jutagejefutix.atwebpages.com/bestiary_6.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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 5052 bytes
SHA-256: daab0c9cd1935a96e2cbb78dbfb90543ef0bce0b29f010aff40326aa642523e9
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10748 bytes
SHA-256: 2bbedda90e5ed866a55bca5e1f56021b7c9c859ea1a1fedc7015077202cd7f61

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