Malicious PDF — malware analysis report

Static analysis result for SHA-256 233b107cd2566e74…

MALICIOUS

PDF

39.5 KB Created: 2020-06-18 01:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 8134df55a7763cc491ab4d58c07ccd94 SHA-1: 91ea9e4216656065db83762689c7487fa5fc4627 SHA-256: 233b107cd2566e740542f1474ef3bc532d177927f9050147afed89edd0c977f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or host malicious content. The embedded URLs and the document body text, though partially obfuscated, reinforce the presence of these external links. No scripts were extracted from this sample.

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://cpanel.joshlucascpa.com/uploads/1/3/1/4/131411411/131411411.html#french+menu+guide PDF link annotation
    • http://hostmaster.bristolplanthire.com/uploads/1/3/0/6/130621542/kujaxozibulotugave.pdfIn PDF document text
    • http://spirithealingandresolution.com/uploads/1/3/1/1/131164043/5582513.pdfIn PDF document text
    • http://cbdproductsusa.org/uploads/1/3/1/4/131483025/7089170.pdfIn PDF document text
    • http://mail.jannieblom.dk/uploads/1/3/1/4/131454692/senamesikopa.pdfIn PDF document text
    • http://beachbumbunny.com/uploads/1/3/0/5/130539837/zipexe.pdfIn PDF document text
    • http://bahamasaugustllc.com/uploads/1/3/1/4/131410939/9773237.pdfIn PDF document text
    • http://energy-frequencies.com/uploads/1/3/0/5/130539009/1561719.pdfIn PDF document text
    • http://mngstories.com/uploads/1/3/1/0/131070148/xesejigut-koxalaj.pdfIn PDF document text
    • http://rockingmfsporthorses.com/uploads/1/3/1/3/131398252/zopazow_xigurevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3E 4580 bytes
SHA-256: ad2866334cf73ae68a7a66c3c64126648580822b85192adcd5f5c47694cf914b
font_01_sfnt_off00006e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E84 11228 bytes
SHA-256: 737bed34cb5b5d1afd2d05b45b5f1323822cf9cb673c1952dfe2a42f51f7d743