Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f37f27150edf5f…

MALICIOUS

PDF

84.9 KB Created: 2021-04-01 17:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c1a3832d789688f448cb48aea797544 SHA-1: c53617257e03200905b139fa7b519351023cead8 SHA-256: 24f37f27150edf5f31989a5e721dc826e5965d2f70e3b4e68a5fc820b2926dae
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 0.9998

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://bologen.ru/wix?keyword=axial+resolution+quizlet PDF link annotation
    • http://sowoxapexemex.sportsontheweb.net/family_feud_online_game_for_students.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/tafiwokajoraluk.pdfIn PDF document text
    • https://latuxuxapeja.weebly.com/uploads/1/3/0/7/130739017/xarelob_kepofijin.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/20599575232.pdfIn PDF document text
    • https://susemozud.weebly.com/uploads/1/3/2/8/132814624/3700929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_601e111116e49.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/75137744119.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/famous_modern_magicians.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fd7879d72daa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/725816a2-4248-419a-8cb9-515c59a54d34/mururokomodotugoranekiz.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_5df025794d00424195fc9a66357da8e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2415d924-bcd3-4939-92b1-0093eabb05dd/apc_back-ups_550_be550g_battery.pdfIn PDF document text
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_b382454585ed4903894e6fb37a971abe.pdf?index=trueIn PDF document text
    • http://xupudajiwozov.epizy.com/molik.pdfIn PDF document text
    • http://gosizabogabam.epizy.com/worlds_largest_board_game_company.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_73e261e8560040eebab23e1217391c76.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 4796 bytes
SHA-256: 369e5ccf5a35dc042e9b629742f39cfd3927f72368bf4ac9602473d1b5b25074
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 10744 bytes
SHA-256: c135212e9331edc71207690a2f543a4d384f43c422a5ea461eeb4d53f220fc52
font_02_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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