Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93db990169aee5d…

MALICIOUS

PDF

49.8 KB Created: 2020-05-24 12:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a15fdbabf290f62ba22a9887d3d66b3 SHA-1: 269ad6ac3896ba51783a741f8936efa80be572bf SHA-256: d93db990169aee5d0324e7a6a78b97b9ee687adb51dcc185f7ef8895c406ec16
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file exhibits characteristics of a link farm, embedding numerous external URLs. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external links, suggesting a deceptive tactic to lure users to potentially malicious content. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the sheer volume of external links points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://hostmaster.fromgreatbritain.com/uploads/1/3/0/6/130620538/130620538.html#ff14+grande+compagnie+grade+capitaine
    • http://mkffl.com/uploads/1/3/1/6/131636651/0162f54387b0e.pdf
    • http://mta22.somekindofsimple.com/uploads/1/3/0/7/130776331/dokaloretewosok.pdf
    • http://justalittlebitecookingcompany.com/uploads/1/3/1/3/131379904/xomisebijizewid.pdf
    • http://dssdq.org/uploads/1/3/0/2/130272336/77793fd2b5e29.pdf
    • http://ifbiblechapel.org/uploads/1/3/0/4/130435939/0a38504a18a5cf.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_off00008a01.bin
584c48a5277e6b20d7836a8cd52a56aeabcd14396741e9c93ee33664eb09ed0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 16472 bytes

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