Malicious PDF — malware analysis report

Static analysis result for SHA-256 4beda71e4528e7de…

MALICIOUS

PDF

71.5 KB Created: 2021-03-03 01:04:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 839b95bacebe23c0bd4a6f3a7c0db4f3 SHA-1: 3153d6bc11dc2c083eccd148f2265a2881e5403e SHA-256: 4beda71e4528e7de5290c0899f355b2973ee11d362647889937209fe38e64485
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or content-farming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. The embedded URLs point to potentially malicious or compromised sites, likely serving as lures for further compromise.

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
  • 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.
  • 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://resalured.ru/123?utm_term=swann+security+camera+wire+repair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458144/normal_602d03c68d83c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_602a396cc8a11.pdfIn PDF document text
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/wisogalef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5fdbc5e11232a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417426/normal_6003b1e3b201c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6020f91ecdf72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fe3f14a650ff.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/1707801.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/d9HjbRu/derailed_taphouse_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_603124fb689f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_6012de7996ca1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456996/normal_600518456334d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/jovipojobukerewasasopulu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/anemia_de_clulas_falciformes_y_paludismo.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 5344 bytes
SHA-256: 84af05b37ba5df77b73a34615cb74d07c90816087ffc4fcbe770c2d317bbc67d
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10460 bytes
SHA-256: 1d24310b7d79ef6b58c6496e1e3b13b533757815cb4e77f8a53d51bd59231776

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