Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0aefc30a6c0057…

MALICIOUS

PDF

78.2 KB Created: 2021-04-10 05:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3fe98d9f99ebf0723ed982ff769ada7 SHA-1: 991c3c115f97ac2af069094d35675736ac94bee6 SHA-256: 6f0aefc30a6c0057c2c11929598230fde022658ce960a98fbf03a02abeffdbd5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://xezojetit.ru/strik?utm_term=peavey+vypyr+ii+vip+1+review', likely serve as entry points for further malicious activity or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=peavey+vypyr+ii+vip+1+review
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/975712.pdf
    • http://kevakigev.medianewsonline.com/bisedapuxabudo.pdf
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/kexeba_zepepuw_dodejanose_zukikemojol.pdf
    • https://cdn-cms.f-static.net/uploads/4366622/normal_602869c5be06f.pdf
    • https://cdn-cms.f-static.net/uploads/4412403/normal_604a3f884fc5c.pdf
    • http://nuzalozipofeven.22web.org/8962206607.pdf
    • http://letaraluzim.scienceontheweb.net/hcnr201_500e_datasheet.pdf
    • https://cdn-cms.f-static.net/uploads/4445333/normal_6067d2bf30ee5.pdf
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/zunopupoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_8e9de9edac694da284693d16b1c93363.pdf?index=true
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_1d3a77cf41c340edb55c97145d8688a9.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_9ad18b18cf3c4bc88464d8d8f4041da9.pdf?index=true
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_76b4f6baa278482f9ec528f1afd34087.pdf?index=true
    • http://kizufalugomux.atwebpages.com/piwafu.pdf
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_711bb405dbd54b96ba6a27c48d9bb14c.pdf?index=true
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_9dd90eb3e01a41e8affe52ea6a4a13a5.pdf?index=true
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_a01d03f668f04968961acf86772f1633.pdf?index=true
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_b1b498d607cb47998a28576ad3423eba.pdf?index=true
    • http://losoxapo.epizy.com/88027534478.pdf
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_992ca74503ff4992a4318797e86d7259.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_off0000f511.bin
a63b15241e6119a519677d30bad1b28cf59258a5e04213a42acf89d0b4282439		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 4908 bytes
font_01_sfnt_off000105f8.bin
5eab903d16b61380687d5d3846902e186c3b2a2e86b9dfa94326bb3cfefc850e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 10956 bytes

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