Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b9c8e960b65e8d…

MALICIOUS

PDF

63.9 KB Created: 2020-03-10 03:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34a1378bff8d193f06354dcbea716129 SHA-1: 07544c1d29870651dd11e7f3e76955ffbb4f1edd SHA-256: 06b9c8e960b65e8d14dc6e608cb1c4b38bf677f26aaf3325deca015b738f24ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to external PDF documents, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The presence of embedded URLs and the overall structure strongly indicate a malicious intent, likely related to SEO spam or hosting further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.Malware.Agent-9780170-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9780170-0
  • 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 http://zxueproe.brdge.org/uploads/1/3/0/7/130740001/130740001.html#vedas+in+hindi+pdf
    • http://stlouiswireless.net/uploads/1/3/0/4/130483928/dowuwuk-pupoxedoti-jidezogu.pdf
    • http://montealegrefarm.com/uploads/1/3/0/2/130274376/2484816.pdf
    • http://bordercollieevents.nl/uploads/1/3/0/6/130620736/885938.pdf
    • http://beckler.shop/uploads/1/3/0/6/130640018/9530163.pdf
    • http://sdbau.shop/uploads/1/3/0/6/130604777/7323420.pdf
    • http://www.30minuteshealing.com/uploads/1/3/0/5/130543240/9329a7.pdf
    • http://b2basics.co.uk/uploads/1/3/0/8/130874031/4c228cdfcd50821.pdf
    • http://casbaad.it/uploads/1/3/0/5/130590208/fimedogujoji.pdf
    • http://playerpimphustler.com/uploads/1/3/0/6/130604358/53f255b8db.pdf
    • http://jtpelectrical.co.uk/uploads/1/3/0/5/130539842/ce4b112.pdf
    • http://oakgrovefarmstn.com/uploads/1/3/0/5/130540193/kojazi-podipif.pdf
    • http://ready2startup.org/uploads/1/3/0/5/130543394/8066389.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f69.bin
3b0b534bd6f38317d02d76c32fc57f25e563b7711e4534878e0a1d6fec9a73aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F69 8188 bytes
font_01_sfnt_off0000bedf.bin
0f656d154c5d73af7433414f04fc54e5b39641d30ad529dde5ca8229ae456640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDF 17280 bytes

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