Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf117506f77e68e6…

MALICIOUS

PDF

78.8 KB Created: 2021-04-06 07:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 02d9e893f05d712fc8b637cd93ec5c87 SHA-1: e8689f024fafb968954804d37414e71b56965bd5 SHA-256: bf117506f77e68e6bcf89cf25abd9c4f4abda9fd5bcdeda3d811d0f44297f733
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting, pointing towards a phishing or malware distribution attempt. The presence of external URIs and the overall detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=contax+g1+no+battery PDF link annotation
    • http://pycnidwzxc.info/74289683755687pe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fed7d8dd8fed.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/1NhgdZk/metal_renk_boya.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5ff4b93291343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_6025119164c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_60353ed61a2c7.pdfIn PDF document text
    • http://vofigasu.medianewsonline.com/iso_37001_an_introduction_to_anti_bribery_management_systems.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/31989520822.pdfIn PDF document text
    • http://topsale.pro/ronavizuzafoduzemegaw10na.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/currency_act_1965.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/hbOgjLN/limafexaxu.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/3gihhoD/46090680859.pdfIn PDF document text
    • http://o-karte-kopilka.com/xetesamofishrn5b.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/iejduii/vupuzaxuvunane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371788/normal_5fc71abc55260.pdfIn PDF document text
    • http://help-verification.com/sex_coloring_book_pagesolpng.pdfIn PDF document text
    • http://wssummer.space/19826814465zmm2y.pdfIn PDF document text
    • http://wativeb.mypressonline.com/21348528371.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/operating_system_concepts_9th_edition_solution_manual_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujided.onlinewebshop.net/sbi_exam_syllabus.pdfIn PDF document text
    • http://samesesodore.onlinewebshop.net/why_is_my_router_internet_light_red.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/menoji.pdfIn PDF document text
    • http://zagupijalixi.myartsonline.com/tappan_range_drip_pans.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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 4912 bytes
SHA-256: 0dba03234e26854a9e42cce5824cd13abf9b8b9b5c6738e7eafd09a1286ab47a
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 11688 bytes
SHA-256: 24f3d77d3a36d29b5be2e33ae6a64b065fc7f143e456c171a806431f9e7db6c0

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