Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e5fbd12ef92cbd…

MALICIOUS

PDF

33.5 KB Created: 2020-06-05 18:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b10df9c5fce28b9435856a96fee9876 SHA-1: e20ca5d05f25d33fee19d1c7c8fbb9492b67d02f SHA-256: 14e5fbd12ef92cbd0a51e79467e9f74330758bd0ab286e254bfbbdc1b82311ea
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 as a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest an attempt to drive traffic or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cffhaw.com/uploads/1/3/1/8/131857049/131857049.html#how+to+draw+warrior+cats
    • http://ententehome.com/uploads/1/3/1/4/131438499/5743644.pdf
    • http://stratford-hvac.com/uploads/1/3/0/5/130589132/6a7ff9ae72dbece.pdf
    • http://thechurchofbrisbane.com/uploads/1/3/0/2/130289379/9312042.pdf
    • http://webmail.opensideup.com/uploads/1/3/1/4/131437216/7691445.pdf
    • http://gwpatterns.com/uploads/1/3/1/8/131857060/nizesomolelutu-soboniviti-garexi-luridufe.pdf
    • http://flooringoutlettexas.com/uploads/1/3/1/8/131871864/wanirofawefib.pdf
    • http://ha.undesirable.us/uploads/1/3/0/4/130493389/ddaa26d.pdf
    • http://korurecruitmentnz.com/uploads/1/3/0/7/130739063/9034497.pdf
    • http://getoffpaper.com/uploads/1/3/0/5/130539428/zedevub-sekajepawo-nodowusemedamix.pdf
    • http://gcagym.org/uploads/1/3/0/7/130739593/tikilo.pdf
    • http://learn-mac.com/uploads/1/3/1/1/131164506/buredavifiliwufawet.pdf
    • http://clioclioz.org/uploads/1/3/0/3/130323415/fonizoxar.pdf
    • http://mustafaobeidat.com/uploads/1/3/0/7/130776642/1e7d094e8.pdf
    • http://cffhaw.com/uploads/1/3/1/8/131857049/terms.html
    • http://cffhaw.com/uploads/1/3/1/8/131857049/dmca.html
    • http://cffhaw.com/uploads/1/3/1/8/131857049/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sotuvevom.files.wordpress.com/2020/06/34110047779.pdf
    • https://ponadewez618744445.files.wordpress.com/2020/06/tomulizonuranuvojopetodes.pdf
    • https://nubiwudowuva456071019.files.wordpress.com/2020/06/fegugiwekotapafagurodoxu.pdf
    • https://jolibepal.files.wordpress.com/2020/06/36914632416.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_off00005a5e.bin
0616fb2cbdc3f6499f7c5dbbe86254ff1ac0afe7725a6e22fecaa9cddc481ccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 9420 bytes