Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daf47b5ddd6a481…

MALICIOUS

PDF

78.1 KB Created: 2021-03-05 08:38:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0d2b38c93b312f552bbf315167a36ad SHA-1: bf8643e93e3724615e04e3803e19a464ae53118c SHA-256: 5daf47b5ddd6a48180c06ca9c5e5f119723f22f84702ec814ae0c4f8196b37c0
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various domains, many of which are hosted on disposable or unknown reputation platforms. The presence of a PDF_SEO_LINK_FARM heuristic firing and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://soxebez.ru/wb?keyword=what%20is%20bass%20theory%20of%20leadership PDF link annotation
    • https://cdn.sqhk.co/wujakegu/iVhfL39/gekop.pdfIn PDF document text
    • https://vumazara.weebly.com/uploads/1/3/0/7/130738753/3806325.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/hiKjhjd/istwa_ayiti_history_of_haitian.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/EfFjf7Q/get_free_skins_and_pets_in_among_us.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_603eed6951ace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_603b905b82851.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/cX5YBpz/laseruseniposofelobakodo.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/ggdKBgi/2nd_grade_subtraction_math_facts_worksheets.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/xokitofanemilir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/poe_blight_encounter_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4294d07a-7302-4877-95bd-11e3b022ca20/3233693487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9466f83d-7c0c-4ba2-87d8-18a69c55f68c/the_social_construction_of_reality_goodreads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc24144c-618e-4ee3-b138-e78951c7f3d4/fudimoniw.pdfIn PDF document text
    • http://zizinamejukurep.rf.gd/petoma.pdfIn PDF document text
    • http://rinafuladimuk.epizy.com/how_to_clean_joy_mini_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7746638d-b854-42c2-9fca-accb6d9be8d4/70146028709.pdfIn PDF document text
    • http://lejibop.rf.gd/language_arts_worksheets_for_2nd_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f853c82-114b-4a89-9911-663bc9232f16/black_and_decker_gh1000_grass_hog_xp_trimmer_replacement_spool.pdfIn PDF document text
    • http://vutevesofu.rf.gd/pagoda_dogwood_tree_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1ffcbd-ffb3-4307-b7ed-6197302bec72/nekaxekedoxu.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_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 5384 bytes
SHA-256: c7386cbfb83636af2b1cbb1be721472cb8e13302b91c1071cd39659830f41624
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 10444 bytes
SHA-256: 99d46c1d9784099cedf8dbffc4bfec69e29bb8decacaee4f73742b7a8727eef0