Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42b64c23a54239a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-27 21:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d03a93b405df1000cb35b433c07e164 SHA-1: 491147cfb1289f57cc294c34ddf4bf66f9e73164 SHA-256: b42b64c23a54239a106d6426d9a5627dcc2fc80bd5095a3261075bc941818fa6
156 Risk Score

Malware Insights

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

The PDF 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 malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/aws?utm_term=gas+furnace+installation+cost
    • https://cdn-cms.f-static.net/uploads/4449422/normal_6041c58f16ac3.pdf
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5fe0afe3ab79c.pdf
    • https://cdn-cms.f-static.net/uploads/4369665/normal_602b9c7b0ecbd.pdf
    • https://gikuxowatevu.weebly.com/uploads/1/3/2/6/132681634/4896641.pdf
    • https://cdn-cms.f-static.net/uploads/4409114/normal_6040c4a0d0403.pdf
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/gasiwito.pdf
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/8837656.pdf
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/3272957.pdf
    • https://cdn-cms.f-static.net/uploads/4486045/normal_60542b254e01a.pdf
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/dobone.pdf
    • https://static.s123-cdn-static.com/uploads/4379961/normal_5fc9928d7eef7.pdf
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fdf56a49b4de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xepululejiwof/pisopokepotafowakuwob.pdf
    • https://s3.amazonaws.com/wixatax/ladixalelisubifapubediri.pdf
    • https://s3.amazonaws.com/fokapikow/meleri.pdf
    • https://s3.amazonaws.com/figidireki/punctuation_worksheets_10th_grade.pdf
    • https://s3.amazonaws.com/sewamos/sawopuwa.pdf
    • https://s3.amazonaws.com/zobuwubedak/sezezef.pdf
    • https://s3.amazonaws.com/wamatasamegu/75487576230.pdf
    • https://s3.amazonaws.com/jadudusujuje/echo_302s_chainsaw_manual.pdf
    • https://s3.amazonaws.com/jupevuxirapi/1086118399.pdf
    • https://s3.amazonaws.com/lixasifasi/pukogerikovaxulig.pdf
    • 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_off0000f60c.bin
3dae4ec69c3306a5504a809f68e61b62756f55cda0aaa4ec3f399e3b3678d200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 4908 bytes
font_01_sfnt_off000106cf.bin
4f910f31dec8c610e015bc35e958b5c022b5993a2a4f5f065a8e3432a6d6bba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10632 bytes

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