Malicious PDF — malware analysis report

Static analysis result for SHA-256 03802e6a06190222…

MALICIOUS

PDF

76.4 KB Created: 2021-06-02 08:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fc16c86ec1d4f26ade09d5de862bed62 SHA-1: 64849efe43eb355980fb3ce1be77c236e9118d1b SHA-256: 03802e6a0619022272ac3512d37eced206f59189a7aa7c1cb56fa3ad01147458
194 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous external links pointing to various PDF files hosted on disposable domains. The presence of a 'Download' button lure and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing sites or download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/pbw?utm_term=splunk+timechart+span+1+day PDF link annotation
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/7928446.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/1467561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_605e0a54f04e2.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/34a28b898fc8f5.pdfIn PDF document text
    • https://tufobedix.weebly.com/uploads/1/3/4/4/134431979/4345066.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/6087934.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/zupotu_pepen_sugoviz_mexunib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_602e640b0948c.pdfIn PDF document text
    • https://fidexirubopuzer.weebly.com/uploads/1/3/2/8/132815065/8311394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/assamese_dj_song_download_2020.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144487113/tivos.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144490161/37608314865.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/f/24503477279.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144447300/vudenupelesixodorakifaz.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/w/file/fetch/144482922/melodyne_studio_4_download_free.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/w/file/fetch/144491697/23437342549.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144486411/service_manual_volvo_s80_2001.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/computer_operator_jobs_mcqs_with_answers.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5636 bytes
SHA-256: 4c429adb43108e8b6dbfd696752399eb279568a0da7565124d7fe54ac68a85d8
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 11680 bytes
SHA-256: b4ededf5f17713ecdc76c51a1f0dd70fd427cd0c9862e52de1b2a82ff5620145

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