Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b3eaab352226d4…

MALICIOUS

PDF

38.7 KB Created: 2020-04-12 01:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6a13b24ac299d3a6907c85cb10603d57 SHA-1: 1b8c95024f4f461254cda06101a51448021286c1 SHA-256: 11b3eaab352226d423cf24ebd262a38208fbda298cd05ef86dec97ca82eca856
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards a phishing or content-luring attack vector, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ewaveinc.com/uploads/1/3/0/9/130969750/130969750.html#micromolar+nanomolar+conversion
    • http://pocketstrategist.com/uploads/1/3/1/4/131437330/fileravojak.pdf
    • http://caloundratoastnewsletterwhatsnewtiies.org/uploads/1/3/0/5/130539440/jerodobibugum-dasawixas.pdf
    • http://jshouseofnoveltees.com/uploads/1/3/1/4/131483488/4117497.pdf
    • http://becomeless.com/uploads/1/3/0/6/130639100/bf2887f87fb1d1f.pdf
    • http://coreycieslak.com/uploads/1/3/0/6/130639734/vubewavozubaxajoru.pdf
    • http://vaonet.info/uploads/1/3/0/8/130873953/d21328e.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a0f.bin
1f87064e39c731a36deb3379564f745ed9fc0f847c0bd0db152caacb4c2953e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 6836 bytes
font_01_sfnt_off0000852a.bin
cf2338b7895a3a873add1db7dfb411390262a2a3d24e5b3dccff59843624ea97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852A 2704 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.