Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc87253fac53eb0…

MALICIOUS

PDF

92.1 KB Created: 2020-11-14 03:46:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254b701aca86016dcfdb95f43804455d SHA-1: 1ecd97c2476196aaaa15136faa889df9641715ef SHA-256: 8cc87253fac53eb0a92b33a80a975704d60e0761d0e6d5529d56dbda6a3cebd9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=brian+and+melissa+save+%252450
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f89ec7f5a66d.pdf
    • https://cdn-cms.f-static.net/uploads/4477620/normal_5faddf391d04f.pdf
    • https://cdn-cms.f-static.net/uploads/4401982/normal_5fa0e4a6389a8.pdf
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/7710437.pdf
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/228389.pdf
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/2faaddb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2bb8abc7-9494-43b3-bdcf-2547f60bb069/duwusewevegezebis.pdf
    • https://s3.amazonaws.com/bupaxomu/formal_email_writing_examples.pdf
    • https://uploads.strikinglycdn.com/files/0e0bf355-ba74-4781-81f1-aaa93196e4ac/fumelavosisofaripumi.pdf
    • https://uploads.strikinglycdn.com/files/8b6f60a0-b3f8-410f-9076-13928cab7b11/bejobegojurixe.pdf
    • https://s3.amazonaws.com/degisapemifa/best_hd_movie_site_quora.pdf
    • https://uploads.strikinglycdn.com/files/502032fd-cab4-430d-bdf2-e3c77e3d21fe/webedojana.pdf
    • https://s3.amazonaws.com/vedexajawo/camscanner_apk_download_for_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/39995d50-c576-4e1b-a68f-1778a541ca35/zexaralu.pdf
    • https://s3.amazonaws.com/tiluwisulepam/checkers_deluxe_free_for_pc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ad9.bin
1fe400cab9e6d8ddb1a9ab21ffbd7350550f9e1e161f1846d4c910bf0befab9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 5584 bytes
font_01_sfnt_off00013dc8.bin
b9955b731bd0bcefd3125e176f20d9a9991342be56d0d43c94bc459171597d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 11916 bytes