Malicious PDF — malware analysis report

Static analysis result for SHA-256 433b5c8fe181eba7…

MALICIOUS

PDF

70.6 KB Created: 2021-06-10 06:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a75cd6ff859121dd07ed0187834a7cee SHA-1: c15d933d88e6d5948219abde18e798a27b235fa2 SHA-256: 433b5c8fe181eba7da28bbeff68a844b1121f1c659a6baff7fca4509d8207d22
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://infrive.ru/pbw?utm_term=hack+candy+crush+soda+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472484/normal_60bb2352d88ea.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4422385/normal_60b689eb5f3ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fdfbfb76a228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5feb064d0fefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_6062f48701b3b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369143/normal_60b763bc1ab2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_606d320cbe944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nerobedevu.pbworks.com/f/wuxuzinizovubupusuwirevad.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144456681/luvexisujumobuwizuxoxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9dab55-fe22-4363-ad42-6e9822237c38/download_primark_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e09b3f-3e54-43b4-b2be-fbcaa067a2bf/why_is_my_sony_car_radio_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0329fe4e-09bd-48eb-9427-605946a7577d/dusuwevawok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47f7305-9a25-40d6-936b-827936cc290b/what_are_the_3_hand_signals_for_driving.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144501753/rotexesaj.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/f/descargar_gta_san_andreas_para_android_gratis_aptoide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fb557d-5869-402e-b8c6-9d42119df199/64119896757.pdfIn PDF document text
    • http://lifevuve.pbworks.com/f/51447978981.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/w/file/fetch/144658359/86436920306.pdfIn PDF document text
    • http://wefolevemud.pbworks.com/f/steps_to_writing_an_essay_for_6th_graders.pdfIn PDF document text
    • http://bomasasawavi.pbworks.com/f/zulimu.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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 5256 bytes
SHA-256: 4c1b16c1ab8d69570e634a287e68867b3d0418bcd7f05631ebafaa656fae8a6f
font_01_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 10500 bytes
SHA-256: 6257b354dc52af0e83333b9fef38d313a5a05e8304a573a892a8166db64a523a

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