Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf100e34f62d8bc…

MALICIOUS

PDF

33.9 KB Created: 2020-06-03 12:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 83cb523dca56877b22dd59ef6672434e SHA-1: fe1e19d85c7ed75fb967c6a5a0e39cadc11632a4 SHA-256: 7bf100e34f62d8bce4e22838d19ad0509f95f4b8f74ea753197a39fa10576bed
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a potential link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to redirect the user to malicious websites or download further payloads.

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://moiessentials.com/uploads/1/3/1/3/131384254/131384254.html#popeye%2527s+voyage%253A+the+quest+for+pappy PDF link annotation
    • http://jjjandkconstructionllc.net/uploads/1/3/1/6/131636965/d3b9131.pdfIn PDF document text
    • http://debndaveswedding.com/uploads/1/3/0/3/130379049/voxikunonakobo.pdfIn PDF document text
    • http://flairparlour.com/uploads/1/3/1/8/131871666/mibigepi.pdfIn PDF document text
    • http://ohsnappicture.net/uploads/1/3/1/3/131398241/pugewebedagab-riwek.pdfIn PDF document text
    • http://ssandh.org/uploads/1/3/1/3/131383648/57b5f5e6b.pdfIn PDF document text
    • http://igexports.net/uploads/1/3/0/2/130289554/7c27c4b.pdfIn PDF document text
    • http://theoptimumlife.net/uploads/1/3/2/3/132303035/6559a5ce98c28.pdfIn PDF document text
    • http://fadeflix.com/uploads/1/3/1/4/131453733/52110f7d9.pdfIn PDF document text
    • http://moiessentials.com/uploads/1/3/1/3/131384254/terms.htmlIn PDF document text
    • http://moiessentials.com/uploads/1/3/1/3/131384254/dmca.htmlIn PDF document text
    • http://moiessentials.com/uploads/1/3/1/3/131384254/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tojugodusino.files.wordpress.com/2020/05/18192120137.pdfIn PDF document text
    • https://riduvetixaxu.files.wordpress.com/2020/05/jedulukirutajurakefokazin.pdfIn PDF document text
    • https://raketulosoke.files.wordpress.com/2020/06/dubuga.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_off000058a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58A3 10488 bytes
SHA-256: 7668c160ec125bac0d78f0398d6b6e69a413e70f61eaad4a185bb7eb2401083d