Malicious PDF — malware analysis report

Static analysis result for SHA-256 641acd1a2509cef6…

MALICIOUS

PDF

37.7 KB Created: 2020-06-01 20:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ce1d96cd602ff6b12b44db6947fabbe SHA-1: 4ac7ae675716129a9db668014204df6f0d6c2723 SHA-256: 641acd1a2509cef6a06eca89db672a527fe74612fb4b08150b4587ee6732f2e9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous URLs points towards a phishing or content-hosting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lukaslife.com/uploads/1/3/0/2/130288639/130288639.html#comcast+wireless+gateway
    • http://banyanparkplaycentre.com/uploads/1/3/0/5/130588998/tasiramopuwesukom.pdf
    • http://marie-scott.com/uploads/1/3/1/0/131070330/d5dfdedca4726b0.pdf
    • http://elrobleinmobiliaria.net/uploads/1/3/0/5/130543366/3436158.pdf
    • http://weiwu1214.com/uploads/1/3/0/6/130603971/dipisofikose_tazubaxaledapi_dozakixarogejeb_jeman.pdf
    • http://lukaslife.com/uploads/1/3/0/2/130288639/terms.html
    • http://lukaslife.com/uploads/1/3/0/2/130288639/dmca.html
    • http://lukaslife.com/uploads/1/3/0/2/130288639/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://belojukoxoja.files.wordpress.com/2020/05/xogerizofaze.pdf
    • https://negowonot.files.wordpress.com/2020/06/gabol.pdf
    • https://tirumefe.files.wordpress.com/2020/05/84040822144.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006650.bin
92e3d2bb49ec176f2a60da714208d91ee8482f2e120697b454138845b71da4e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6650 10968 bytes

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