Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd849a347cc8635f…

MALICIOUS

PDF

82.1 KB Created: 2021-03-27 16:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: df1b17228dc88d54ed433484ec029946 SHA-1: 54a05b902370dea8997ec798433dda89948f6638 SHA-256: cd849a347cc8635ffb664519c5a4cbd34599a6e5baf27dbfaa486c546c585612
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://midufefew.ru/wix?keyword=intex+12x24+pool+installation+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490256/normal_603eed1a2344e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5ff9155682f79.pdfIn PDF document text
    • http://javatow.22web.org/basic_geometry_vocabulary_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_6039f36c581be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_600f1db72f990.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/L6ibRgc/75030894837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_6036a468e25cc.pdfIn PDF document text
    • http://nowofuguvinidaw.iblogger.org/bonanza_bros_mega_drive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_6012580d5f213.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/jhdjgie/gift_soccer_win_real_gifts_online.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
    • http://lozufifeme.epizy.com/zawavurapili.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/devil_may_cry_4_apk_data.pdfIn PDF document text
    • http://xafamikipu.epizy.com/35155652292.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/huckleberry_finn_reading_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/zapem.pdfIn PDF document text
    • http://bukemexuladorux.epizy.com/nipevired.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/basic_principles_in_the_coso_framework_for_internal_controls.pdfIn PDF document text
    • http://wupomadupu.epizy.com/60931842200.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/intermittent_fasting_meal_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5028 bytes
SHA-256: 8b1d528514ff8857d2b301611b120843b14152cbdb4ea5da37a04407f574c04d
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 11672 bytes
SHA-256: 8863af375584a1fdea5e9a1b87ae7fc45aa2f821fe46837d937df7f4f56fe0fd
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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