Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b055cae3f066c5…

MALICIOUS

PDF

75.9 KB Created: 2021-06-01 03:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d18db4a65e1b1d4fa0024343b192e363 SHA-1: ecd375a3d73286503901db9fd3a0a17ca6e06825 SHA-256: 31b055cae3f066c521a3bcd70816772e941f797c0d69e48249b352f0e5402bc8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links on disposable hosting suggests a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=headlightmag+sales+report+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480748/normal_605d512f4efa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5fee55bc5f7e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_5fd865221a916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5ffeb91f29c35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465701/normal_60071948dfd52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fd1f175ad556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409992/normal_603837025e1a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_601e37b761a37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poforezufovu.pbworks.com/f/55167006306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee30da1-59e9-4ff2-815f-7c6997514380/delonghi_pinguino_portable_air_conditioner_not_blowing_cold_air.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/download_anime_shokugeki_no_souma_s3_sub_indo_batch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63fb495-b25d-4e0c-a6b5-fde4e433ca86/poema_tu_risa_pablo_neruda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb9c83f-cc8b-49a7-a232-a9a022f52c3a/zifato.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/one_block_wonder_quilt_tutorial.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/gawomula.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144428169/do_i_need_a_doctors_note_for_maternity_leave.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144431751/zirexizudugizevod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195a4979-e4d9-49ef-9ae0-62b09256cbdc/biology_lab_report_citation_format.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144435732/ek_raat_mp3_ringtone_download_pagalworld.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247c3bc5-5a8e-4058-b9fb-dd629cd060e9/lease_agreement_termination_notice_template.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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5816 bytes
SHA-256: 6ef5743783fe2180b011acbaf4663bb882532f8811d7590acc33ea3fc541d9d2
font_01_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 11196 bytes
SHA-256: 303bc32571dd751d0bcae909688e9db45101b9512e4807138fd41c3018f551d9

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