Malicious PDF — malware analysis report

Static analysis result for SHA-256 c110a7046dfdb7e8…

MALICIOUS

PDF

69.8 KB Created: 2021-04-01 11:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e515d9cf257e381adf674cde7c383b09 SHA-1: b05601140c6ddfbd3f74507f213c6fe022a64ab0 SHA-256: c110a7046dfdb7e8068efb71d49e143340ccd179a33283c601463c939fd5d102
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded links pointing to suspicious domains, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=shackleton+s+journey+activity+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_6055494f8a898.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/ibps_rrb_clerk_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_60488c1d96ab0.pdfIn PDF document text
    • http://dombitarf.ru/tinuga66vff.pdfIn PDF document text
    • https://torosiwetub.weebly.com/uploads/1/3/5/3/135351177/1c390aa75156b.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/tNNhhtZ/zemefimemibigiteboxer.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/13332985548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5ff1d8b0426ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_605951d04f8a3.pdfIn PDF document text
    • http://ashotik.space/7091227195jmuuu.pdfIn PDF document text
    • http://khareedforosh.com/45537982644l9elt.pdfIn PDF document text
    • https://jomaredavox.weebly.com/uploads/1/3/2/3/132302995/kijuburedes_bojen.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/nBEG8PC/21811124063.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/best_islamic_books_in_urdu_download.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/3445864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daponub.epizy.com/rujuridowazofunaxejib.pdfIn PDF document text
    • http://dawejur.atwebpages.com/classification_of_anti_tb_drugs.pdfIn PDF document text
    • http://wekujugom.epizy.com/kickoff_meeting_email_template.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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 5788 bytes
SHA-256: 1d344df57c7b573af9843dbd8f34b2941a34200403a5e93d4849f87abfe0299d
font_01_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 11144 bytes
SHA-256: 3c890b12c7f18007bb094b0e74c938d10025e640ffa80a29efdc1f6561c1d735

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