Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bef2a1cf4bef6c…

MALICIOUS

PDF

73.4 KB Created: 2021-03-26 10:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea0dff27e44d25a667d669fe9951c541 SHA-1: 6afd9401a6ac5b808db68b487fc66d1549697735 SHA-256: b2bef2a1cf4bef6cd65d3b8c237cb7d8a008d124e48e8424b0a00ceea0fd7711
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://jumiwimov.ru/123?utm_term=descriptive+geometry+book+pdf PDF link annotation
    • https://cdn.sqhk.co/baxorurifina/Q9WTojg/stickman_ninja_2_ultimate_ninja_warrior.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/zikib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fee467593839.pdfIn PDF document text
    • https://rojisubul.weebly.com/uploads/1/3/4/5/134593633/sojeka_nagebazunet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491410/normal_5fefda043c2ad.pdfIn PDF document text
    • https://mizunilido.weebly.com/uploads/1/3/4/3/134352057/bb9d89.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/raxosodikikoxe.pdfIn PDF document text
    • https://bulejoge.weebly.com/uploads/1/3/0/7/130775594/soxuna-wepubesirim-zagiza.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/tifuw.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/2061907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494663/normal_6054045716a3a.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/2485029.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/pototisebudiworevin.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/eF9OVge/exercise_hd_pics.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Ys6ghhi/alone_quotes_in_english_for_girl_share_chat.pdfIn PDF document text
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/talunogefulodupisax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d68814-961d-4dc1-95b5-d38e16570637/garmin_nuvi_55lm_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/pasavegexowuvidotan.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/sticker_maker_for_whatsapp_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/deere_co_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/informatica_data_quality_interview_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551b18dc-a777-4b7d-ae50-3d519736c970/theory_of_the_novel_guido_mazzoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f698f165-4b71-44fd-a4cf-750cd2e9062b/asus_rp-ac68u_quick_start_guide.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_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 5600 bytes
SHA-256: 003779ba8d490691dffa1a829da5a3de23c59e0179ab595f6679ca62f5dfc076
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 11268 bytes
SHA-256: 69f4b5773e093bf4f34ec2b4910b9a487ed54d1cd38323ffec5f7706550a4af5