Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a78f2903028a91b…

MALICIOUS

PDF

34.8 KB Created: 2020-04-01 20:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3c8b6b240f007a3b91732336ac3c809d SHA-1: 965ff961df2aded246f9e255c37ffb2a843ddb10 SHA-256: 6a78f2903028a91b74257539ca882b01a9c7237b6ea45825b0e649d59143b180
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. While no scripts were directly extracted, the PDF structure and the numerous external links suggest an attempt to redirect users to potentially harmful resources, possibly as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://wellwithacupuncture.com/uploads/1/3/0/5/130551505/130551505.html#struct+dirent+source+code
    • http://prefig.org/uploads/1/3/0/5/130550960/2102161.pdf
    • http://onwardaccounting.com/uploads/1/3/0/5/130590164/1dd2e.pdf
    • http://eliteblindsandinstallations.com/uploads/1/3/0/6/130639511/f21944098c.pdf
    • http://htscontracting.net/uploads/1/3/0/7/130775843/wejotinibefe.pdf
    • http://hairbyheirgroom.com/uploads/1/3/0/2/130273576/verosujeju.pdf
    • http://aquacoffeeshop.com/uploads/1/3/0/6/130604161/xozuxejipub_zudufefanem_bizase_dusotazomi.pdf
    • http://tammymclain.net/uploads/1/3/1/4/131453031/4350c16b5a.pdf
    • http://sempertigris.com/uploads/1/3/0/5/130544413/30a7853.pdf
    • http://kabariintegratedwellness.com/uploads/1/3/0/7/130776358/bf7f1f2f597e593.pdf
    • http://fortworthrotary.org/uploads/1/3/0/7/130775368/xixumojizixemumidesu.pdf
    • http://citypulse360.com/uploads/1/3/0/6/130620619/6431526.pdf
    • http://weebly-hvacequipmentsales.com/uploads/1/3/0/6/130604324/9ed66123a59516.pdf
    • http://mta-sts.mail.whitneyelliottphotography.com/uploads/1/3/1/3/131398392/6852174.pdf
    • http://ahc.ua.edu/uploads/1/3/1/4/131437813/jorezagojog.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d3b.bin
ee92062a70eff35313e787af617c6714a6242e179fbb1b222beb052e4b7faef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3B 8592 bytes

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