Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65d0b4df25141c0…

MALICIOUS

PDF

94.4 KB Created: 2021-05-16 07:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a84d592d4b8c561c1bf935ff65799b8e SHA-1: 5444bd34e135fbf7a6275036fadccdb7e0884f61 SHA-256: d65d0b4df25141c08a4bf504e59e4044e782e60c6a4634f5d7819cc1633e12b2
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF structure strongly suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/strik?utm_term=the+lion+the+witch+and+the+wardrobe+%25281988+tv+serial%2529+videos PDF link annotation
    • http://lufosopaxukil.getenjoyment.net/javascript_manual_2020.pdfIn PDF document text
    • https://dudefusuze.weebly.com/uploads/1/3/4/6/134628774/77ce3.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ifPhSWo/knights_of_ages.pdfIn PDF document text
    • https://cdn.sqhk.co/nobegasosev/jyifhfo/archero_guide_lost_castle.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/RigdjRs/wedekevamamijuvebobi.pdfIn PDF document text
    • https://gunagejosiva.weebly.com/uploads/1/3/0/7/130738835/6591753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_601d364ab8387.pdfIn PDF document text
    • https://suxobotomifupol.weebly.com/uploads/1/3/4/4/134445318/jitidetelizup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_606a9508ca896.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/50e0059291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_600d3d8b0947f.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/uDhfZEd/meludopofujedejebobezizuv.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/38a27028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_6063c76cc9ca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_6047d43fc2cac.pdfIn PDF document text
    • http://ramidavukul.medianewsonline.com/senior_chair_yoga_sequence.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00012530.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00012530.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00015d68.bin)
    • http://visevagopar.onlinewebshop.net/teoria_da_biognese_e_abiognese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b4408a-47ad-4386-a5c8-0bf87af87160/casio_g_shock_watches_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564ab48b-c892-4dc6-871c-c277c3dfb27d/tamomafumix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498b49d7-d887-4cf5-a108-a2a7a186fa2e/84344984933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394be905-751e-4c2a-abb2-6dde2869db53/34869571837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2635016-ac5e-4ca4-971b-92e780eee394/jesus_calling_sarah_young_enjoying_peace_in_his_presence.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 extracted file (font_00_sfnt_off00012530.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 5612 bytes
SHA-256: dd1093a62fd22b33f839691e1beeffd9219cd9857b2046198ab1d327ab26d97d
font_01_sfnt_off00013853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 10888 bytes
SHA-256: a64744adfd97b5f9fe52aebbf6fe767d9fa597a703944fa80ae1df992997b9b0
font_02_sfnt_off00015d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D68 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176