Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8b52c9af6d25f9…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 21:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfae268fccb3a51301174917da524303 SHA-1: e9acd51cd71e6c1b1c140b74f0993a85f370d20a SHA-256: cb8b52c9af6d25f9ce33d83f5498292bec2a392b60ac180894a25ed1606c5cce
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one prominent URL being https://jumiwimov.ru/award?keyword=agorafobia+adalah+pdf. The document's structure and the presence of numerous external links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=agorafobia+adalah+pdf
    • https://cdn-cms.f-static.net/uploads/4423148/normal_603cbe4f3bf89.pdf
    • https://cdn.sqhk.co/ruduligived/igkhbhj/50122693241.pdf
    • https://static.s123-cdn-static.com/uploads/4444100/normal_6007704479113.pdf
    • https://rokotejipap.weebly.com/uploads/1/3/0/8/130814190/7452125.pdf
    • https://gipudakewisuvu.weebly.com/uploads/1/3/4/6/134665668/3990014.pdf
    • https://cdn.sqhk.co/rilowikapaz/idhc9PC/dazor.pdf
    • https://cdn.sqhk.co/sewujuzanas/gjgicjj/redbox_new_releases_october.pdf
    • https://cdn.sqhk.co/kobedobofepo/hcibggL/28811417734.pdf
    • https://cdn-cms.f-static.net/uploads/4371508/normal_60163b3abd438.pdf
    • https://cdn-cms.f-static.net/uploads/4365584/normal_6061246f8e184.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_605b00e061684.pdf
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5ff15b427782d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_75818e67fff148b3961fa4b7d8d5bbce.pdf?index=true
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_56e008ced34c4637a513e02e01bb34ec.pdf?index=true
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_bed4f637a01a4a4e9975780c2ca3b50b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2c4a243d-3d7b-4811-8d1e-a152f18d9222/ler_livros_em_ingles_online_gratis.pdf
    • https://uploads.strikinglycdn.com/files/6b2bad2c-a661-4442-ab48-a0647e31f773/89822293516.pdf
    • https://uploads.strikinglycdn.com/files/d796ba1e-5be8-484a-8d35-96aa9daf650e/26731402408.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_fcbbe3df61de4951aad908b6450f7b78.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7954f022-1819-4a99-93c2-2e6fd0edc18b/network_specialist_interview_questions_and_answers.pdf
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_2034878a1b234cbcbe6b1b13aa332d00.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_off0000f407.bin
1645ce54b80f7e8357b5acdc1984fcf13397c9070a23dbdb5ac6b34945da00c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 5252 bytes
font_01_sfnt_off000105df.bin
b2ac6297564d0b878b7ce6864ac5bfc9ab93aa94b9d17e1c9b63196d59a4fe91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10356 bytes

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