Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3cffece5ce411a…

MALICIOUS

PDF

69.3 KB Created: 2021-02-21 21:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 514d5628fd7a60089bd519d9c8eebfba SHA-1: df12c6995768abdcb174c3ee03d72ef09c9d8eec SHA-256: cb3cffece5ce411a7a8ea71bdc39d2d513bb537c400b925d4f3ba331a9f58bfe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or a mechanism for hosting further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://druttle.ru/wb?keyword=top%205%20business%20books%20to%20read PDF link annotation
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/5762350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5ff166f679bbc.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/poxogimukis.pdfIn PDF document text
    • https://fevokixesebu.weebly.com/uploads/1/3/0/7/130776230/ruzobofikibijuzojuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/sap_business_one_accounting_module.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/vejakimupimag.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/62377417281.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/31244223574.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/glow_recipe_watermelon_sheet_mask_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/graphing_rational_functions_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/98786889258.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/dutuxaligij.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/5305620285.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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 5200 bytes
SHA-256: fe4789d52e758a6dd10a439a186dc03cee8e73546f578e41026301aced5f7847
font_01_sfnt_off0000e638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE638 10080 bytes
SHA-256: 9f30c29425ee73a7b896ccb3fedeea8d2a5319d25c5b9b7ac27df07b8b26ac25

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