Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b3daa18f4c7f0d…

MALICIOUS

PDF

70.4 KB Created: 2021-03-20 22:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2ac553d98ce04cf91c9ee1ad419d39b5 SHA-1: a4b4e9bd58a3a7c26da9e6f22572dace002ad6d8 SHA-256: a8b3daa18f4c7f0de95da8f9e56695bad361326e901af426f443f74f5dda5986
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external links, with several pointing to potentially malicious domains, suggesting it acts as a lure to external content. The presence of embedded URLs and the PDF's structure, described as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=etiology+classification+and+epidemiology+of+stroke+pdf PDF link annotation
    • https://cdn.sqhk.co/videmixolute/xahfhem/8899979303.pdfIn PDF document text
    • http://vinnipoh.fun/nekazomibuvuzisw2v4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_60450e8fa7316.pdfIn PDF document text
    • http://abwaab.su/bootstrap_themes_free_for_html56rwl8.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/ifOjadY/divitiwe.pdfIn PDF document text
    • http://fafekaju.22web.org/lolunuroresuwewaxikexiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_603e435494c9b.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/cNieP6I/drag_racing_fast_drag_car_racing_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_6046c9eb0903d.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/dP0gdT5/93375419974.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fcf475fc52ea.pdfIn PDF document text
    • http://zzzmmmmejjj.space/wivepobadapotf261.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/gefN34S/81269685279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dalapodomunok.epizy.com/60722698476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652b0946-7dd2-4bb5-8d9b-abbb2359368b/is_battle_of_gods_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/85327206199.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/gunaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5644117d-ce42-4706-9d3c-15275d4ff31b/9181090653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269bfa82-b13d-4786-87bd-2f805c0dcb8c/persuasion_jane_austen_movie_1995_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/how_many_questions_are_on_the_math_ged_test_2019.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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 5600 bytes
SHA-256: 81f389ba23ba92a313069a5365ee071fa42b664638249f9158922fadbcbea898
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 10264 bytes
SHA-256: fef39480b0e777e562e83e0772f942f5d0b4302d46cb40f2be41c6d9564d1220

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