Malicious PDF — malware analysis report

Static analysis result for SHA-256 8867a6658a773e53…

MALICIOUS

PDF

31.6 KB Created: 2020-06-13 14:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: dc0e98804824b9817a813c9a45a19b71 SHA-1: 4c98ee97616e858beccfc1ffe929a75087024571 SHA-256: 8867a6658a773e53d4547628eaac4c7a0d793eb67a90ddf3419f2c253d7d99b0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a method to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the embedded URLs suggest a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://peopleinsyncltd.com/uploads/1/3/0/3/130313002/130313002.html#racing+car++picture PDF link annotation
    • http://mail.areabrooklyn.com/uploads/1/3/0/4/130483163/dalipafalowuvokitit.pdfIn PDF document text
    • http://caladivolpe.devsite-1.com/uploads/1/3/1/4/131453096/muguwosopegejixejufi.pdfIn PDF document text
    • http://mail.worryknot.co.uk/uploads/1/3/1/8/131871894/8022030.pdfIn PDF document text
    • http://cycling.meonsprings.com/uploads/1/3/0/6/130621431/8b1271b83eacd.pdfIn PDF document text
    • http://lashandalewismusic.com/uploads/1/3/0/7/130739237/megezuworoxurupase.pdfIn PDF document text
    • http://simplysaigeboutique.com/uploads/1/3/0/6/130604286/jazifolin-wedekukilokakof.pdfIn PDF document text
    • http://ashleygrandkoskiacupuncture.com/uploads/1/3/1/4/131406437/3016378.pdfIn PDF document text
    • http://hostmaster.4140designs.com/uploads/1/3/0/7/130775635/05a0d1c1.pdfIn PDF document text
    • http://marleerussell.com/uploads/1/3/1/6/131606578/9160159.pdfIn PDF document text
    • http://jolenes-fashions.com/uploads/1/3/0/5/130589171/4331177.pdfIn PDF document text
    • http://guaguancofestival.com/uploads/1/3/1/6/131606335/vubatufiza.pdfIn PDF document text
    • http://sophistable.com/uploads/1/3/0/8/130813030/6423126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fatoturomixo.files.wordpress.com/2020/06/2656859330.pdfIn PDF document text
    • https://jezowiv.files.wordpress.com/2020/06/66879892469.pdfIn PDF document text
    • https://tagogoxe317728397.files.wordpress.com/2020/06/wakidokupefesilomojiba.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50FC 10068 bytes
SHA-256: 46c6dd1415411d619e7389b08cd50b431faf19ae47aa6976e5672bf3903e0b52