Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa19fb2c288ad7b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 04:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9b82b1bdd5b5afeb244b0ef85fae8c8 SHA-1: f7de3ddba1c5aae76c38d2be460abafcfa84907b SHA-256: 7aa19fb2c288ad7b8c386abff11db3b849797aa597022f09d54c5d3d90f3b4d9
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=what+is+a+tentative+thesis+statement+example PDF link annotation
    • https://cdn.sqhk.co/fakineduxafe/Bifjjhk/gibekesizazanobagove.pdfIn PDF document text
    • https://lijujizakivim.weebly.com/uploads/1/3/4/6/134634855/5c47b015ff8493.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/2385042.pdfIn PDF document text
    • https://cdn.sqhk.co/lemisobe/ZgdliaS/homemade_raspberry_jam_with_pectin.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/bb7c4adfe1.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/IRCqghF/2071263548.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/fjgjblO/bubimib.pdfIn PDF document text
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/fa6d86.pdfIn PDF document text
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/nilawoluruxodug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/68979495267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3763b59f-2976-4625-bbf2-3288bcd2e992/30564409884.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_9263289da383478397399332c5e005ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/the_frankenstein_chronicles_season_1_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/88701143243.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_e0d2e156138d4899b041057c3980784b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/kufokaxoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0affceed-fb1a-45e7-a0ce-1e02d173c7a5/30919596127.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/picsart_editor_photo.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_4ed2bc0a46af4870a30c844d74e9ed3b.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_1fab0f1be1bc4f42ac8d895bab5e4bc9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 4780 bytes
SHA-256: e030bd88a1af6c41d46316876e8d8be34af45d40ab69f8fd8cab5dc96024dacf
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10284 bytes
SHA-256: bc7993b3e015ebecc49eec333f857f22d3f59a1dd83b964749c17847011d9810
font_02_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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