Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8b23b68a33cfe6…

MALICIOUS

PDF

39.9 KB Created: 2020-04-13 13:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f1ce38af34b480f7a0848dd64c2d369 SHA-1: d6fac7e3c9f3276c5c0203e002977518b04578d7 SHA-256: 2d8b23b68a33cfe63a1aab673dc61aff20e4f39da9cdad662429265177484b45
94 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, many pointing to other PDF files hosted on similar domains. This behavior is indicative of a link farm or SEO spam campaign, designed to drive traffic to potentially malicious or low-quality content. The document body, though partially corrupted, contains text related to 'Normas apa 2019 para ensayos en word', suggesting a lure to attract users searching for academic formatting guidelines. The ML classifier strongly flagged this PDF as malicious.

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://westpalmtree.com/uploads/1/3/0/4/130435694/130435694.html#normas+apa+2019+para+ensayos+en+word
    • http://laughingcatfibers.shop/uploads/1/3/1/4/131407867/jupuwozevetefabenofu.pdf
    • http://healthcareoils.com/uploads/1/3/0/6/130620871/mawuxijopuvefi.pdf
    • http://ancienthand.net/uploads/1/3/1/4/131437584/5193375.pdf
    • http://thesispro.org/uploads/1/3/0/3/130379424/4749807.pdf
    • http://atlanticnationals.info/uploads/1/3/0/6/130620818/724741e00e.pdf
    • http://smallbusinessgrowers.com/uploads/1/3/0/6/130604209/tuvulodege.pdf
    • http://morrowtimes.com/uploads/1/3/1/3/131383998/2213502.pdf
    • http://livcentral.com/uploads/1/3/0/5/130551106/b3d575.pdf
    • http://jackrthompson.net/uploads/1/3/0/2/130288562/jugor.pdf
    • http://talvon.be/uploads/1/3/0/5/130589191/dutiturerorimod_fisatet.pdf
    • http://3feetforpete.org/uploads/1/3/0/6/130604933/6919319.pdf
    • http://regencyhotelhumbletx.com/uploads/1/3/0/7/130775912/f78c80f.pdf
    • http://cabinet-replacement.com/uploads/1/3/0/3/130323190/f756b4819721ac.pdf
    • http://skylandsconsulting.com/uploads/1/3/0/6/130621829/3c56ee3.pdf
    • http://hirechase.com/uploads/1/3/0/4/130483679/7230816.pdf
    • http://3feetforpete.or
    • 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_off000070fd.bin
c036dce20e53fddd24c25dc401347d77e67e7c8f1f71402360e82cf2fea8e10f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FD 8880 bytes

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