Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a7e9eeeeb3039b…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 15:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4d80062b8700419535acbbc87e7c8f8a SHA-1: 17d6e7aa213e51a4db009354e6f54b85eab47ecd SHA-256: c2a7e9eeeeb3039b7a1a9bd1d82e89b808b5900a022ff2e7399ab15dadc0beb7
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 of which point to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The primary URL, https://kuzutuzo.ru/strik, appears to be part of this malicious infrastructure.

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://kuzutuzo.ru/strik?utm_term=duet+ht+whirlpool+error+codes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5ff275daeb318.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/UAh0ihC/58923143971.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_60078d082f47c.pdfIn PDF document text
    • https://mazakodavowur.weebly.com/uploads/1/3/4/3/134335882/posewinogukabir-bufejelebiv.pdfIn PDF document text
    • https://mapevitesofik.weebly.com/uploads/1/3/1/6/131606073/dd4981d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_601d9bf173fe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_6031bd2ee6114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368740/normal_5fe5d2d1a443b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5ff2115e2d6b7.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/i5Pijij/pinball_arcade_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5ffc2cbd6532d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019f737b6dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_6021ed2177e91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_f736b471708041b5b883491d606fa204.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_11046768f5404d3fa405179027f8d8f5.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_221d404eea784d26933848ada97c2924.pdf?index=trueIn 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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5044 bytes
SHA-256: 1693ab8c7bc39db47316d9027dd67a80d0c05396117fb1763c52d4be9e9d17c0
font_01_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 10228 bytes
SHA-256: 1b481da228b0f5e198a374abc146901fdb3e8f3fc632d9952e6b88f8fd05a3aa

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