Malicious PDF — malware analysis report

Static analysis result for SHA-256 984c624cfda8a72d…

MALICIOUS

PDF

74.4 KB Created: 2020-12-03 20:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c5eb80b896359fe3f14eff58b3469d2d SHA-1: dc53cafb97f33a3d4398b365d89b20b02581a847 SHA-256: 984c624cfda8a72db365930d8e4d0ee2a3893f6da93bb6c93add688e75c61f13
214 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ggtraff.ru/strik?utm_term=impossible+quiz+walkthrough+15 In PDF document text
    • https://vuxaxumiduwo.weebly.com/uploads/1/3/4/6/134603627/fdd7d7.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/povire.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
    • https://s3.amazonaws.com/niporofez/conus_medullaris_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/weekly_work_schedule_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/written_advertisement_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/43303701520.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/affidavit_of_bona_fide_marriage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1469fd4-d7b4-4f24-a7f0-ed7bf1483b68/monoprice_graphics_tablet_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8428dc-484e-450e-b36b-6d430f38eca3/umatilla_county_jail_address.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/esc_guidelines_pulmonary_embolism_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe63f38-14dd-4cb1-a63d-96477a20d357/earth_an_introduction_to_physical_geology.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/3136227742.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/nesaru.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 5592 bytes
SHA-256: 8250967e12d524da19d2d20d52a8412292572f29cc283067a14d1601a9f559c1
font_02_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10604 bytes
SHA-256: 25d89e9433e0bcbee8d4f92e762097e4e8751a2bb0e994f4efcb31a341b5695a
font_03_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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