Malicious PDF — malware analysis report

Static analysis result for SHA-256 511fa00cf7da3645…

MALICIOUS

PDF

98.7 KB Created: 2021-03-16 02:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c8c89d4a92b2d03c8b2d9801b3749b55 SHA-1: 4c34abd53ba2b64ed3293bdfcf4cc139a6ac3b0b SHA-256: 511fa00cf7da36453d98e34837ace23c1509d3384550e165101c0ada000be65c
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to phishing sites. The primary URL, https://ponafet.ru/strik, is likely part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=great+writing+fifth+edition+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5ffdea5d9a546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fe117fc806e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_601faf089c547.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/hbjbsje/dopifozavupo.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/jjjs2uY/background_pics_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/iSgfDo9/factory_of_heroes_fantasy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_602d0111a101e.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/1ChjZbB/pentagon_shape_angles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wujixus/45922450005.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_b9d59e56bc734b8fa87659aeae877d37.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_8e97884b78bb4014baaf5714b24d87f0.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_d588a62499ad491a943e20e2983a2bf6.pdf?index=trueIn PDF document text
    • http://jinuritubamo.rf.gd/26581179583.pdfIn PDF document text
    • http://paxevufofuf.epizy.com/skype_for_win_xp_sp3_free.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_49d1837f180e43b9bc7e551afce7f4ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/51680130047.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/kilopefewozuvu.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_1a2e4eff486a4546ad1bd39a507aa074.pdf?index=trueIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_a07091ae7c7c4b92ac707681c2ea9f0d.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_351fc21f372841dcab6d895c2dea49eb.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_075c1c087c2546a79c9d9719046fa4fd.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_ce36b40f3676488fad8722aecd95e975.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/74203074685.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_off00014527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14527 5428 bytes
SHA-256: 701fa1653c56a36474bd91cb954d5a3eef60634d381cda20d90eee8560a07a49
font_01_sfnt_off000157b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B8 11036 bytes
SHA-256: 93ac5d299f8bdee03a77983a1b6614b412d9b47b65edb0d316ea25bc61bf757f

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