Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b2b979423ed5ef…

MALICIOUS

PDF

85.2 KB Created: 2021-03-24 21:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f49535ecf77eff9af410d86ca404404 SHA-1: 20f6ed1f3f94b920bfe695a3f0def20e096d73ed SHA-256: c3b2b979423ed5ef2a7561838a2590030462ffb707ddba1f08076042176dfc3a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs, such as 'https://zajinet.ru/wix?keyword=free+haynes+workshop+manuals+download', suggest a phishing or SEO spamming attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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-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://zajinet.ru/wix?keyword=free+haynes+workshop+manuals+download
    • http://zixivudu.getenjoyment.net/xojilesevilerekobewa.pdf
    • http://kvyovk.xyz/chalkboard_birthday_invitation_template_freet3cwi.pdf
    • https://cdn-cms.f-static.net/uploads/4421983/normal_6023fd8602fc2.pdf
    • http://kedugobepuged.mywebcommunity.org/aprender_espanhol_sozinho_livro.pdf
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5ff1e66d8bcb8.pdf
    • http://luminar4-download.xyz/11407696208lis0w.pdf
    • http://fuxanujibiz.mygamesonline.org/20187163603.pdf
    • http://pemizirevubel.mywebcommunity.org/sar_of_antihypertensive_drugs.pdf
    • http://zotikarida.medianewsonline.com/vutebipokomikurig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xoguwavosuje/odia_love_shayari_photo_hd.pdf
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_6ed5b660fb8f47b2bb9c61a9d97eeda6.pdf?index=true
    • https://s3.amazonaws.com/xukanomarexumu/8032253887.pdf
    • https://s3.amazonaws.com/tamobalasu/62478746058.pdf
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_3d14cd9754cd4be989fc60916724e6ad.pdf?index=true
    • https://s3.amazonaws.com/farefasejikap/lidegevukorosoge.pdf
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_918383672408421ea882b7240dd58dde.pdf?index=true
    • https://s3.amazonaws.com/gagotaniwipure/70044866760.pdf
    • http://dovunufesesiz.onlinewebshop.net/simolujujoxigazalajadufe.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_b4f58b188a294a54b013d009f9217b41.pdf?index=true
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_61133932348449e39a49cf8a3ae8e69c.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_off000110a0.bin
c57e719adf5ddb6b72472db11838bbfae875d73a89ce42d44c3686c0941313e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 5412 bytes
font_01_sfnt_off000122fc.bin
23f04b821e2cbaf7498687b0a99f712fb6f72068390064fa8a0305251170fdd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 10764 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.