Malicious PDF — malware analysis report

Static analysis result for SHA-256 77550a80b79d9583…

MALICIOUS

PDF

38.2 KB Created: 2020-03-30 07:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25d1214f0ef27d8eb93902fec6ebafb0 SHA-1: 913cd96593b5174780c7aea07db763fd5e9d9132 SHA-256: 77550a80b79d958317542b29f805b66ad12b8dd379a25f698d5335e04913787f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO poisoning or redirecting users to malicious sites. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to leverage external resources for malicious purposes, potentially through JavaScript execution within the PDF viewer.

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://jessica-and-jaso-1.rominastiebenphotography.com/uploads/1/3/1/3/131383624/131383624.html#faerie+queene+book+1+canto+9
    • http://samsmoviereviews.com/uploads/1/3/0/6/130639161/wuwisizagumad.pdf
    • http://urbanstones.net/uploads/1/3/0/6/130639518/xidazedujukepovoxewo.pdf
    • http://insuranceswla.com/uploads/1/3/0/2/130288523/2dfd48d19ce5924.pdf
    • http://jessicajoyreveles.com/uploads/1/3/0/5/130545998/504896324c.pdf
    • http://jessenenglish.com/uploads/1/3/0/6/130640059/vazavodiruvasog.pdf
    • http://shandyzsheshed.com/uploads/1/3/0/7/130775772/pegesazazud.pdf
    • http://books4hearts.com/uploads/1/3/0/2/130270796/e90a78b6a.pdf
    • http://blackouttrading.com/uploads/1/3/0/7/130775258/9293629.pdf
    • http://rechargedxb.com/uploads/1/3/0/6/130604855/72ccc9294.pdf
    • http://autodiscover.greenmeteorteam.com/uploads/1/3/1/3/131383227/bebij-kizebunumoge-nerejir.pdf
    • http://hirosystech.com/uploads/1/3/0/8/130873833/7119547.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_off00006de9.bin
9546dab403a71d56a4a289d3f9630958ffee6aa661f9ba6c8e1dc8f6aaf976be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 7768 bytes

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