Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4f9eb97dd6baef…

MALICIOUS

PDF

73.3 KB Created: 2021-03-08 08:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5b40de4904b319c6ebdf8bee67aac572 SHA-1: 27b8e7f4a421f456f420f135308264e2aeac3ea0 SHA-256: dc4f9eb97dd6baef51343e5b338043b8ffc55f0ec973dd6b48b0d853eebdb6d7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. It contains an embedded URL that redirects to 'https://maypoin.ru/strik?utm_term=best+international+business+news+app', which is likely used to lure users into a phishing scheme. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

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://maypoin.ru/strik?utm_term=best+international+business+news+app PDF link annotation
    • https://cdn.sqhk.co/nufomewo/ig6Xfgi/75744448613.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489251/normal_5fe4658e02953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_601da80d764a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_600374ddab962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_602e2aaedf41f.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/KtZiifc/note_color_notes_to-_do_reminders_calendar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_603d44ec4d35e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_601671fa26582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5fdbcce99f2db.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/1ghLlMw/41424010180.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/gihhjhb/steelers_ravens_odds_las_vegas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogufisojorosef.epizy.com/gradle_test_report_customization.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/44893094678.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/56126515316.pdfIn PDF document text
    • http://gulavofi.epizy.com/adding_and_subtracting_polynomials_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/gugoroziw.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/dajipoxun.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/80995370882.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/frozen_fever_2.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5092 bytes
SHA-256: 7ff9364187c036cbfb0d922b99d6ed99644b39b778f6ab2e847a062786d9e933
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 10624 bytes
SHA-256: 757e225e4370991932f66ee83afe14a8c6d765b9017aa86b282aa924cf1e3a6f

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