Malicious PDF — malware analysis report

Static analysis result for SHA-256 257bc9259c0ceb74…

MALICIOUS

PDF

84.0 KB Created: 2021-03-20 14:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad47af5fbb9f9377a2f7dd53876e5232 SHA-1: 9e64fb65124fddcebb43434fa7f15d1b70c2ec3c SHA-256: 257bc9259c0ceb7468e9547be0c4b68995300a4b8645de37f3472e61a817f2c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://midufefew.ru/award?keyword=declaration+cession+v%25C3%25A9hicule+occasion+pdf PDF link annotation
    • http://kazexezawulozij.mypressonline.com/68508903520.pdfIn PDF document text
    • http://mediaverifiedbadge.com/54779140098ow2wt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_6030400f51de9.pdfIn PDF document text
    • http://menformula.xyz/paguvapororo3y93x.pdfIn PDF document text
    • http://masito.space/how_to_edit_your_own_writingpumwp.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/sefug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379030/normal_5fee47c55bf98.pdfIn PDF document text
    • http://all-host.site/2017_lexus_ls_460_review_car_and_driver3aqpq.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/f748e.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/4311677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_605534e28c5f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebovufuvuji.myartsonline.com/what_is_client_centered_therapy_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd16b7ab-e3d5-4d4c-ab2a-380ed2e03a50/walt_whitman_as_a_poet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecfd9f1-9c82-4c3c-96d7-5466506ddd81/linear_function_graph_worksheet.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/29950934291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1995ba71-ee4b-4422-936d-487f8b2012a2/irregular_verb_list_in_english.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_9f4ddbb190384ca8ac41e2bd4c9eb6d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b947c6af-0916-4174-8472-cb874ab9e6d8/mononajodutevilix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc2f3a-36db-409d-b147-6f3c858042eb/38916294933.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/2012_jeep_grand_cherokee_headlight_assembly.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_2dbb721a064241e880f591a82501eb05.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_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 5444 bytes
SHA-256: 503b7a3c95c7636c032503d04aa6e9bbef5c3face5485a26a28efe5096a66cca
font_01_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 12204 bytes
SHA-256: 811927a2414233a083a4e9a438d210d80366894b75194f05c3ec84cb15f45420

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