Malicious PDF — malware analysis report

Static analysis result for SHA-256 595f1660ede9568b…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 13:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 522c95932ff7b13c476de4890cf5a023 SHA-1: bb2a68b04d842528068ed3080715db1d05612b8f SHA-256: 595f1660ede9568b013dbdaf6443c7df1515f98a93ae5c97b6cd6085f9fb700f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The presence of external URIs and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly suggest a phishing or malware distribution attempt.

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://vilenefex.ru/aws?utm_term=python+list+pop+off+front PDF link annotation
    • http://motorutovibipe.sportsontheweb.net/icao_annex_2_2020.pdfIn PDF document text
    • http://fisitupogavi.mypressonline.com/53833273000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448323/normal_5ff59f8d0d6d1.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/24270598125.pdfIn PDF document text
    • http://vesajob.getenjoyment.net/36502158628.pdfIn PDF document text
    • https://cdn.sqhk.co/puzokopu/hge82hq/4388707463.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/DWjdH95/30528878091.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/wTPH9hd/moto_racing_club_highway_rider.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/haier_portable_air_conditioner_parts_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476010/normal_5febe0430c7bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_601b93eb30978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbd1344-a71f-4382-b1c1-2cf5d23eadc3/business_english_words_list_with_meaning.pdfIn PDF document text
    • http://tirevotijo.epizy.com/atavistic_medial_cuneiform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b10c5c-a48c-434f-971a-5d1e1ab80be3/what_is_the_difference_between_dyson_v11_animal_and_torque_drive.pdfIn PDF document text
    • http://zafovitunopejus.epizy.com/guided_media_ppt.pdfIn PDF document text
    • http://felepukagerek.epizy.com/online_spanish_classes_for_nurses.pdfIn PDF document text
    • http://tekojexabutixas.epizy.com/yowhatsapp_apkpure_versi_terbaru.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/2467749748.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 4880 bytes
SHA-256: d020a32225d31082f0e9b221f8c97800b257f71a5d89d29d8b0ef9871e1ddc0a
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 11156 bytes
SHA-256: 6ad89bed5e68f07ae1dbdce62687b219aac00f8a3976550e8b9791d91fd34a02

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