Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fba9809b2ec4c49…

MALICIOUS

PDF

61.1 KB Created: 2020-12-16 01:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 21bd2f5f12ffa22633a5f743cb6ffe90 SHA-1: 2b38ea2a35d98a9c5319b23da056f9bb15c46bf4 SHA-256: 0fba9809b2ec4c49542da25c85ffb5c8dc701d80db788ae470898e146df7b7fc
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://cctraff.ru/aws?utm_term=bethusile+mcinga+uyakhathala+ngam. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=bethusile+mcinga+uyakhathala+ngam In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5f91f7427c64b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_5fd60b8ef3e1e.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/5d6b7774f0df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5fad69c70dbf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449000/normal_5fcd6637200a0.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/tetevesabep-bawam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5fa267484634b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2a1ec917750a3d7d2c6/t/5fc271e1eaf37e3b64eb477f/1606578657884/solving_systems_with_matrices_worksheet_show_all_work_for_full_credit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419140b0-2751-4a9c-b869-8a1285eac636/tewirixaxorofegaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743d1320-fb4a-42c0-aac3-98d2502a04ff/vijomufetigipagaput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5c0713-1d0b-4bb8-8f23-d38af0380007/genie_wet_dry_vacuum_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3592bde6-86ab-449d-846f-9026c81c6b6d/mensaje_de_cumpleaos_para_una_hermana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a813a539-8327-413b-82c7-1ac637793347/46836248495.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/android_phone_manager_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/atualidades_para_enem_2019.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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 5332 bytes
SHA-256: 1cfea2c329ead529e6cbb0be9b2bb28a1745ea9686adf221b249fd11c7a6073f
font_01_sfnt_off0000c16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16A 11460 bytes
SHA-256: 5fb091c80e65df9c8a046791aaeb0be0853b226d4162dfc1aed8aee7d9fa3e89

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