Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c2f95a3220bbc2…

MALICIOUS

PDF

72.4 KB Created: 2021-02-08 08:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20facf0791a1b749aed73a11c8d92004 SHA-1: 3f8f88040cfdb3b7209e01ce340fcf8965258ce8 SHA-256: 41c2f95a3220bbc21be962dc628f255226ef554605ef888f743ece8be0b230ff
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, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=sheet+separator+machine+manufacturers PDF link annotation
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/d348a1e11d763c.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/vewojoraxokazonab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5ffc0bcf6af28.pdfIn PDF document text
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/kebikapisukedek_wedemefajige.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/zebamibekuxo-jezuvowaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fcd0fdaa3d91.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/iaieHje/35061412262.pdfIn PDF document text
    • https://cdn.sqhk.co/pesofesidoke/hgjTgiI/parkour_spiral_map_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5ffe254510952.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/dhjekOe/67528048141.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/gubuwilegenubojifes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369322/normal_5fef5e39139fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ffce1e4cf898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_601f313458a71.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/VNhd2ig/61796638674.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/midizaxopazeji/gixogugubavorafiwobavaf.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/best_2d_animation_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/35688903231.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/ffqax_fact_sheet.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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 5328 bytes
SHA-256: 4886b66fdee6ed9fb900786eb388776cf76b24b8ca60c18ec4289fcc52ce21ee
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 10656 bytes
SHA-256: 4561190bcb1a0d156399e2d2e6ef56e4ea7d37c2bc1ef5f89a4e6e79b4a64e41

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