Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3f4addbb3dfbcf…

MALICIOUS

PDF

41.7 KB Created: 2020-04-02 23:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efeb6bcd8b2bedd78e6015d105801ac1 SHA-1: 3fca666978f4c81bb41375d948b05f44f548ef75 SHA-256: 1b3f4addbb3dfbcf913bd525210d07fbb5794fc87b50114ae744408628d3c857
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern. No scripts were extracted, but the sheer volume of outbound links suggests a high likelihood of malicious intent, possibly for SEO spam or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://wichitadoggroomers.com/uploads/1/3/0/7/130776075/130776075.html#shooting+table+diy
    • http://refreshhomestaging.net/uploads/1/3/0/6/130620950/gejovof.pdf
    • http://tecovasfoundation.com/uploads/1/3/1/3/131383679/4763c2f.pdf
    • http://axminster-ringcraft.com/uploads/1/3/0/5/130539019/lurekajisinif.pdf
    • http://asesorarteeventos.com/uploads/1/3/0/2/130291365/bf60a.pdf
    • http://tistamporoma.com/uploads/1/3/0/3/130313613/1589466.pdf
    • http://yvcomaha.org/uploads/1/3/0/6/130605072/tipevawutogos_zuzok_zawixi_zibuved.pdf
    • http://keithromanoski.com/uploads/1/3/0/3/130379087/kitatajak-purefamog-foxukafezebuz.pdf
    • http://memphisfest.org/uploads/1/3/0/5/130546237/1981849.pdf
    • http://academicsuccess.info/uploads/1/3/0/9/130968981/1785731.pdf
    • http://voyage-en-grand-angle.com/uploads/1/3/0/4/130436299/sagixufo.pdf
    • http://3lmboutique.com/uploads/1/3/0/5/130539497/wepinezuzebewikewon.pdf
    • http://codillis.com/uploads/1/3/1/4/131453321/fukenu.pdf
    • http://blscontractingllc.com/uploads/1/3/0/4/130436288/2577607.pdf
    • http://toutlestote.com/uploads/1/3/0/6/130639642/ea0433e5c04c39.pdf
    • http://dearrdesign.com/uploads/1/3/0/5/130589328/wofofitaxaka_pimepad.pdf
    • http://bestflooringco.com/uploads/1/3/0/6/130620598/jozofenusut_buvusonixej_zikexub_mekosik.pdf
    • http://sadpw2017.com/uploads/1/3/0/2/130272955/8212289.pdf
    • http://mtlplumber.com/uploads/1/3/0/2/130289564/wojuwominiletivizug.pdf
    • http://platinumflights.com/uploads/1/3/0/2/130271195/ribukerop-sizawodosodek-fuxatenu-jamerusam.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_off00007792.bin
c498a710140e9d6a7a78aa6704458a52380dbcf4785e6c45d86e33688f7c31ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x7792 8956 bytes