Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3568de07f0e10fb…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 07:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 31faece8c1b8e6cf2dd41e3733a0a38c SHA-1: a0652b41298eca1e183290d492a5e924d911773d SHA-256: a3568de07f0e10fbcc4a29962c4baaa4195405495d3218eb710009a06604a128
194 Risk Score

Malware Insights

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

This PDF document was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://gimoguvi.ru/123?utm_term=internal+carotid+artery+occlusion+case+report', is likely the primary malicious destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gimoguvi.ru/123?utm_term=internal+carotid+artery+occlusion+case+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5ff2152ecd23e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5fd96b8c38a44.pdfIn PDF document text
    • http://jesofoma.getenjoyment.net/5499857860.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/93763244812.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/construct_2_pseudo_3d.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/59961477336.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/how_to_check_chainsaw_chain_size.pdfIn PDF document text
    • http://dududuw.mypressonline.com/92145996539.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/56496142067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_af1c128df226430fb3bd2057287a8544.pdf?index=trueIn PDF document text
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_283d07fad1f94d399fb7062136754532.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_513958d5d8d647ad8f3dc916baef4119.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_52d6ba9b87894cd1aa42c9c67091fead.pdf?index=trueIn PDF document text
    • http://suniwuvujibo.epizy.com/pentatonic_lyre_sheet_music.pdfIn PDF document text
    • http://devisufuxuvit.epizy.com/47769044982.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_f5c21514e4c74ff09324d54ad4e0b253.pdf?index=trueIn PDF document text
    • http://putiremupupunis.epizy.com/fate_grand_order_drop_rates_spreadsheet.pdfIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_a2f14c9a21e147f38a3136a43658e03b.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_275b5bbd52e147288883dc7749176e5b.pdf?index=trueIn PDF document text
    • http://wesovipimamino.epizy.com/beyond_the_edge_2018_english_subtitles.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/52186227207.pdfIn PDF document text
    • https://5ec50ee2-6c76-415b-b731-82d7de26534b.filesusr.com/ugd/826e74_8341a2ccf4dd4f268c20ea76bb8fd93a.pdf?index=trueIn 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_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 5108 bytes
SHA-256: 28e033934ef573d9e7a2d5e1a94171a170574bc9bb173c6c8cf25c14e4dcaf06
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 10292 bytes
SHA-256: c6299bdb150b634ee99c6a58a7b7f4fef5fc524dfbaf553e58c9c15609e748e3

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