Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95fac3fefcc7f72…

MALICIOUS

PDF

95.6 KB Created: 2021-03-23 21:22:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 11266a730b19cdcde528e6e46f5337ef SHA-1: 5f9fcf849abd041fd99c1bee2931ad7080e3d555 SHA-256: f95fac3fefcc7f7226db64ac5bdacb5db806aa7dda745e3b19d2175b02b607da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the sheer volume of suspicious links is the primary indicator of malicious activity.

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/123?utm_term=brandenburg+concerto+no.+2+piccolo+trumpet+pdf PDF link annotation
    • http://copyrightshelpscenters.com/lasubibofumig6wp8.pdfIn PDF document text
    • http://gromstroy.com/what_kind_of_transmission_fluid_does_a_2001_honda_odyssey_takept6in.pdfIn PDF document text
    • http://gladkoe-telo.xyz/87785242045lonm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_6042e1acb820d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5fffc32300f0c.pdfIn PDF document text
    • http://want-seo.ru/operations_management_by_william_j._stevenson_13th_edition_solutionslsgeh.pdfIn PDF document text
    • http://webcam-model.online/how_to_connect_iphone_7_to_verizon_network_extendernbpy8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366343/normal_5fc56f44e7ea1.pdfIn PDF document text
    • http://remontnatali.ru/dean_koontz_net_worthb0bed.pdfIn PDF document text
    • http://begemotiks.space/fixusobasoxege8d2af.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/sexual_preference_straight_meaning.pdfIn PDF document text
    • http://kind-insta.site/dujifirojemafawuzobk7eli.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/kabexizovakugakazupub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5ff3f08a5b236.pdfIn PDF document text
    • http://card2card-perevod24.site/dixomuvemilg30e8.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/xaniteja9uxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_5fd86c9667d12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fc8b03a4ef43.pdfIn PDF document text
    • http://goodsun.space/harmonic_progression_problems_with_solutionslxdfs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_605834cd895fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zerowegujij.onlinewebshop.net/how_to_bake_cake_in_panasonic_microwave.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/larami.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 5652 bytes
SHA-256: 25aa6d0fa4fc9ebf33c465c2470ffe19be6fe84f3b357031364848f3b7d42f92
font_01_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 12480 bytes
SHA-256: f985342f976c645baf3480f853f4d0da80eae8e51786bb5172807b2b68895103
font_02_sfnt_off00015b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8B 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832

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