Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a11ee664125d3b…

MALICIOUS

PDF

71.3 KB Created: 2021-04-02 18:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb317594c114ce931f269375e22fad73 SHA-1: 5d49c035050a96cf263a7314dcb002184a9efe04 SHA-256: e2a11ee664125d3bbca06ef6f117cc95500f93535ee21353219e8d6c714b2f46
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=amd+a4-+6300+network+driver PDF link annotation
    • http://bukudix.getenjoyment.net/improper_waste_disposal_in_the_philippines.pdfIn PDF document text
    • http://dijemakipesozox.iblogger.org/zitifawisexe.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/antrag_schwerbehindertenausweis_nrw.pdfIn PDF document text
    • http://getfreecreditreport.info/facebook_lite_for_version_2._3._6c42aj.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/why_is_my_altec_lansing_speaker_not_connecting.pdfIn PDF document text
    • http://leziwazedo.mypressonline.com/where_is_my_fridge_filter_located.pdfIn PDF document text
    • http://dibezoko.22web.org/gajijijotexekumiwekinago.pdfIn PDF document text
    • http://iminn.ru/rikupezakowatemobamug76qm.pdfIn PDF document text
    • http://impergamon.com/singer_simple_sewing_machine_troubleshootingckjui.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_6aab453dde644e828f167b17f975dca0.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_03097f5d01a4405599ca7f7c4952f3ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/84216159256.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/73872046225.pdfIn PDF document text
    • http://nipesuvaz.epizy.com/30483928.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/blend_for_visual_studio_2019.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_c25e4a4f823b4698af99ca45f80cfa8f.pdf?index=trueIn PDF document text
    • http://lusovipipowa.epizy.com/nunegabivarirajif.pdfIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_47fc09c240a642a48c2a173753be0dc2.pdf?index=trueIn PDF document text
    • http://pevurevakube.rf.gd/great_quotes_about_life.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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 5548 bytes
SHA-256: f74c356ae771c8f3724a09c5ff4ce42d661baedfcf8aeefcb3124651ac266d2f
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10552 bytes
SHA-256: fffc0203087b0c8ae557def43c4e21f24d127e6ad8006a3f4a66679dc8c1f02c

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