Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6e4d7387d3a16c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-06 12:35:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f15ab991c53ab4c477af922e86f06293 SHA-1: bbf51ff71c5665c57bb079cf726a411a075d85e5 SHA-256: 1e6e4d7387d3a16caf564dc2217f5f5df05452761d1f91e6ce2a811c38ecee21
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or phishing attempt. ClamAV detection and ML classification strongly indicate maliciousness. The embedded URLs likely lead to malicious content or phishing pages, and the document's structure suggests it's designed to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=python+compare+dictionary+keys+to+list
    • https://fafafupoxojamu.weebly.com/uploads/1/3/5/3/135350358/notetolixu_tiviwu_fotenopubin_gitidi.pdf
    • https://cdn.sqhk.co/tinipuded/ifEEihf/29535372068.pdf
    • https://rofozewoguse.weebly.com/uploads/1/3/1/3/131384025/9d54a9006.pdf
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fce18daccf5e.pdf
    • https://cdn.sqhk.co/fegadosijete/gfgfjeA/vakevufajenemelef.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/716b96fab181c.pdf
    • https://dodirubiv.weebly.com/uploads/1/3/4/5/134505429/nebelupojuraje-tuzitemawaduji-zikati.pdf
    • https://cdn-cms.f-static.net/uploads/4459777/normal_601a315eb72b6.pdf
    • https://cdn-cms.f-static.net/uploads/4481155/normal_6021a66bdc7c4.pdf
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5fcaaded1e3c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_4212a71b5c8a4667893187e1426ac933.pdf?index=true
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_81660d90526c4f5fb6be4100655bdaa9.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_905dd5ecd4094e8ea1ec8cac7d73fd75.pdf?index=true
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_bf0716301bb44254800a1d23e94085af.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_c6fbbaf40ffc4cc9bd047c48aa25f1c5.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_cd2955e8b69645f4aa460f7b19ffa0bf.pdf?index=true
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_0481490410de4ea580359afe3e3efa2c.pdf?index=true
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_cda2b7b5efef465abed1f5e7f9e74e77.pdf?index=true
    • 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_off0000e788.bin
e4ff0446389464dfdb704383cd856067a76f54b5fd36e7a449f838ceea6a2757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 5480 bytes
font_01_sfnt_off0000fa03.bin
3f8bbd9093575877d5a824f723d5eb4bf52e52801f6377ee3bd21305ff7e2133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 11668 bytes

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