Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df9f4bd761bfe5f…

MALICIOUS

PDF

81.4 KB Created: 2021-04-06 15:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ba290710375fd3013f1c3ec122efbc13 SHA-1: 27d758668b03c9d931af9a2568a300e5e9d0c0b3 SHA-256: 5df9f4bd761bfe5f844cdeadc43fa1bcc30c0c24a499c9e13fd471dc49100ded
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure referencing a book summary, which is a common tactic for phishing or malware distribution. It redirects to a URL that has been flagged as suspicious and is associated with SEO redirectors for free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/strik?utm_term=seven+habits+of+a+highly+effective+teenager+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417527/normal_606a4fdd6e8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_60307afe2ecd6.pdfIn PDF document text
    • http://fekijijiz.iblogger.org/sociological_theories_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/Jlt5ib6/37613745600.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/7Zjjjj4/kigopizego.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/hirhgPw/renufutamuguzereb.pdfIn PDF document text
    • https://cdn.sqhk.co/nanuvoxeva/dCahbjf/debt_payment_calculator_excel_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/jgMCSjh/33144259050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_605ef656bfc21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0313b614-f87d-40aa-b9ed-d7b401395746/29710759992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab24f230-f9ce-46ef-9822-0ad8d6d7352f/98302737423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d15f25-10ae-415e-9719-0d84b327666a/kjv_study_bible_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba776bdf-420f-483c-91b1-91587b02cb00/pimuwukejafevotomukopoge.pdfIn PDF document text
    • http://sedilipabowarad.rf.gd/car_seat_expiration_date_chicco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd378a01-98f4-4360-acd9-7760690261da/20135891095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a287f40f-f3e2-43ac-8c2e-5943877fe10c/54218698267.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_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 5700 bytes
SHA-256: a79484a17b2f7b2ed9088eed66e6a575b9f0c635fb865e17f41e43d395756438
font_01_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 10480 bytes
SHA-256: edd81787399fc10c4f2f2b4c0f130102530723d8fe84805406b11ec715dca244

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