Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e341843d19da40…

MALICIOUS

PDF

35.9 KB Created: 2020-06-23 05:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b60062bd6d265be9f7b7bb298f58295 SHA-1: c6c9918d0e913d199943e3855d8ac241f88ebf12 SHA-256: 17e341843d19da40be08d47f17d4b1247d79d147a5863eb2fb7b2b66963655fa
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as downloaders or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mail.airambulancesingapore.com/uploads/1/3/0/7/130776249/130776249.html#wedding+dance+lessons+edmonton
    • http://shelterislandsupermarket.com/uploads/1/3/0/8/130813783/28938.pdf
    • http://lynnobrienmusic.com/uploads/1/3/1/6/131606006/cf08ecb6a79.pdf
    • http://votechrisjerram.com/uploads/1/3/0/5/130546385/defiziwajaf.pdf
    • http://unblindedstore.com/uploads/1/3/0/6/130621645/kovutu.pdf
    • http://lightupweightloss.com/uploads/1/3/0/6/130620736/0d9878e1.pdf
    • http://hostmaster.cocinamexicanalancaster.com/uploads/1/3/1/8/131856703/4296fca8c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005027.bin
ce81c67fe3978ed2073b04a5ed7cfadd177cb8ae01ec5227cd9b4b7274730831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5027 4964 bytes
font_01_sfnt_off000060f6.bin
b73ed2ebc29fdd85fac55334c10da2d6ff4976bc7a5cedc9371696cf8806b6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F6 10212 bytes

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