Malicious PDF — malware analysis report

Static analysis result for SHA-256 78430a95bbf96df2…

MALICIOUS

PDF

77.7 KB Created: 2021-06-09 20:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 586597faeb91b5ee80922f4a2d8ad2bb SHA-1: 795ce0624c902f2022faf9b7e9ac586f5f277a55 SHA-256: 78430a95bbf96df27b0cbf1c60eb7acd190ef4f3cc4f0eceee6f74b942c334c7
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 contains a high-severity heuristic indicating it's a lure for free downloads, redirecting to a suspicious URL. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URL is likely used to download a second-stage payload or redirect to a phishing page.

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://jacksth.ru/123?utm_term=describe+allotropic+forms+of+sulphur PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4471096/normal_60afef1f80e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_602561cf24f82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500189/normal_5ff4c9e5206db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6019331e33897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60171e57c99a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://razodegotit.pbworks.com/w/file/fetch/144729126/27408494725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4879e9d4-d6d7-416a-9193-7fc50eeb5847/selinapogizukuvur.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144843948/learning_activity_sheets_for_grade_4_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d42b95-3403-454d-be6d-26072d11d8bf/is_engineering_good_in_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db24c29f-1c77-4b8b-b947-df6957f520a0/lamborghini_terzo_millennio_prezzo_listino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e11c014a-8775-490b-9933-3e683d2a56f3/zukef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4352f0f6-7ef4-4348-a3c6-a112a69913b2/2553769404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de4882c-e917-4e7d-95c2-8536cb07dd88/where_is_the_seashell_mansion_links_awakening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256645db-7b5a-4303-a45d-5d0e3dd782cd/rezos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f23693-ffde-4c8a-ae8b-66f3c39fe98c/statistics_for_business_decision_making_and_analysis_3rd_edition_answers.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/w/file/fetch/144546414/64802888154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43959f7a-82a7-480c-9c5e-79677f5e7db6/kalegipevetojuxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b323c73-729a-4c7a-9263-74fde7c8364c/wilson_combat_beretta_92_trigger_kit.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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5396 bytes
SHA-256: bf68c2fadec8fbb5443e4c425640509be74ec9c6b50bae9211336df3d10706c4
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 10956 bytes
SHA-256: 8f14965aaac1ef98649a2809808d927674344437601ed21edb3b95ccca7979e8

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