Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf41001abcb60a6…

MALICIOUS

PDF

77.5 KB Created: 2020-12-27 01:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f4b67cee49ec88d395bc405885633dcc SHA-1: 1fb41629637f41bbbd771762d42c19cdc225fc7b SHA-256: 7bf41001abcb60a6cd22eb2bd584a207ab5e38d9f8c9aac9a220ec422e8e7efc
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=horse+riding+games+online+free In PDF document text
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/titav-denisanusu-dinano-waxiwimopubu.pdfIn PDF document text
    • https://tisikifa.weebly.com/uploads/1/3/4/6/134614219/nimewuxuzajari.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/2222984.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://uploads.strikinglycdn.com/files/22809947-b04f-49bd-861f-683815781e20/jirajobimalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd1f56a-b3ac-4214-b356-361d9ab8d336/54046626009.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/pdf_to_dwg_converter_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9513c1e2-e6e4-48e1-bb85-fbfb1dfda53e/34449127305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3921acb8-804d-403f-8a56-9dae654251ae/19547737015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88c8b01-445f-40b2-9265-a07d4215fe1f/nubixapodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d24f525-c66c-434f-8151-0e506bbad37b/xefozarawajir.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/bolton_sixth_form_college_application.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/handy_seamless_transitions_free_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8376231a-c4a9-4c30-92a6-4726a2a4acc2/xufaxopanexifo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 4896 bytes
SHA-256: ae015e97cd363387a9dc32d2e4c74e87fb7081236662a88075d5cf3713d29511
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 11420 bytes
SHA-256: f0f71855f00c13960e583a3fe47c829b3a60454f71b11483a02d7af0115c15d2
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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