Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9d453ebd13c475…

MALICIOUS

PDF

77.0 KB Created: 2021-04-07 15:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a4021d0ffb2f10d25c22c4d8689ba8cb SHA-1: b08c46ce23f4a710cc4a12e61b97867f102fe840 SHA-256: 5d9d453ebd13c475623531a1ce8f4191904a8d6fe70ffd9907a90ee6e6dac798
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=ap+lang+synthesis+essay+prompt+2019 PDF link annotation
    • http://wijetaz.mypressonline.com/d_link_dap_1522_login.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/3Ohe6gj/vowizivilanatebop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5fe84d16f0691.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/vuker.pdfIn PDF document text
    • http://josebixotarez.22web.org/34356625639.pdfIn PDF document text
    • https://cdn.sqhk.co/tozijizubu/Ahenoie/display_balance_sheet_accounts_tcode_in_sap.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/kYo7qjg/exponential_two_points_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_601442861c995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_6023dc7eb9e0b.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/dusuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_6054e365ac7cb.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/32422501915.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/8258246339.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanefelizili.epizy.com/93087496288.pdfIn PDF document text
    • http://torulebofi.rf.gd/brutus_1_summary.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_5b9206e4b3d14d97911d36240ae5de08.pdf?index=trueIn PDF document text
    • http://sadebanowufovox.rf.gd/86295089252.pdfIn PDF document text
    • https://183cab0c-2e2b-44e6-b55a-0f82cb58e578.filesusr.com/ugd/133137_769c66a19ab442f8a648be123e54c8fe.pdf?index=trueIn PDF document text
    • http://jopubijako.atwebpages.com/top_10_interview_questions_and_answers_english.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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5804 bytes
SHA-256: 091058005909c895cf43d87499f6c743d45cfc3158aa9055081c447c56aba9cd
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 10996 bytes
SHA-256: 82ebcdfdfd521fc604fadd20a27eb4043e492118d4bf4372c995d48d7efd0cb3

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