Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c8e02d56c8871c…

MALICIOUS

PDF

67.4 KB Created: 2021-05-29 21:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b0da2d1e6b9a7ebb2c9c53505fc2262f SHA-1: 4a4fa2a8370412a24815f6561e0880bdc60210cb SHA-256: d3c8e02d56c8871cb19e64e86841b3f15269d9517a60c2f968d4ed6a09d87b66
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=libro+como+usar+el+cerebro+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5fda28bfc7ecb.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/rujejogikupam-sefunanelexo-witirabojeni.pdfIn PDF document text
    • https://gapeduruje.weebly.com/uploads/1/3/2/6/132681343/1e758f45f7d00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fcf1453bf936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418185/normal_5ff759ea7566d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476270/normal_6024b7386af5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5fee61c1b14bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ffb81fa8da7c.pdfIn PDF document text
    • https://kuxelozipapim.weebly.com/uploads/1/3/1/8/131871637/022777414dfe08.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/wikurixopow.pdfIn PDF document text
    • https://vibufimibe.weebly.com/uploads/1/3/0/7/130738819/lagikumoxojexab-pedasosap.pdfIn PDF document text
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/wekesalamaduxeduwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457561/normal_5ffdc70ec54ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_5fe90624903b7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413363/normal_60affd42d47bf.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/88665.pdfIn PDF document text
    • https://wugarusuxota.weebly.com/uploads/1/3/0/8/130814120/pegikomikin_fimirili_wuzajixuzaxuri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7ac0c8-b826-4f1e-af41-313c951a78bc/6203546727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53839681-5a09-4dce-ab49-e10449f57415/epson_workforce_600_bluetooth_setup.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 5556 bytes
SHA-256: 32b8018ba63bc091db989554f4946bee959dd22384507c97feb7b9b1b70478d9
font_01_sfnt_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 10364 bytes
SHA-256: 9f44db875c9fcf7e69540e8aa3bfa48cd242b30c264bcd34cc633bf488e04167

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