Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc39800e85c89d38…

MALICIOUS

PDF

53.0 KB Created: 2020-06-05 08:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e4078983618206c77db5a4abfd9ffb SHA-1: bbadffdad9c444c01da16cd31053259afd37cff7 SHA-256: bc39800e85c89d388906c98a49b40141a774268143fe3be8b395f83ead64b312
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a common technique for SEO spam or redirecting users to malicious sites. The ML classifier strongly flagged this PDF as malicious. The document body mentions 'Catamaran hobie cat 16' and is generated by wkhtmltopdf, suggesting a lure for users interested in this topic to click on the embedded links.

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://keriwillproofit.com/uploads/1/3/1/3/131381963/131381963.html#catamaran+hobie+cat+16
    • http://host181.carmichaelnl.com/uploads/1/3/1/3/131378795/pinur_lujapixuv.pdf
    • http://dietfixit.com.au/uploads/1/3/0/5/130588964/dc0caf1d9.pdf
    • http://studentsandcollege.com/uploads/1/3/0/7/130775652/5eab57196765.pdf
    • http://mckillopdesigns.com/uploads/1/3/1/8/131871477/siwokisufojolil-xojoxe.pdf
    • http://midiowaworkingdog.com/uploads/1/3/0/9/130969372/c1fd413b3e5b.pdf
    • http://mx.efy-online.com/uploads/1/3/0/7/130739433/nevipawixugobaf-vaguli-memuboruk.pdf
    • http://blackbackpacker.com/uploads/1/3/0/5/130590416/5ee1e7a320a2bb7.pdf
    • http://vivianarrington.com/uploads/1/3/1/0/131070485/xilaze.pdf
    • http://vanessalara19.com/uploads/1/3/0/3/130313081/6373781.pdf
    • http://keriwillproofit.com/uploads/1/3/1/3/131381963/terms.html
    • http://keriwillproofit.com/uploads/1/3/1/3/131381963/dmca.html
    • http://keriwillproofit.com/uploads/1/3/1/3/131381963/policy.html
    • https://jojazoxo.files.wordpress.com/2020/06/tukaxaronejobevizok.pdf
    • https://megelufebax.files.wordpress.com/2020/06/vamonozukovigikugukajo.pdf
    • https://tixiwufagu.files.wordpress.com/2020/06/mamunufaf.pdf
    • https://gapirepipu.files.wordpress.com/2020/06/wekakuxorugesoxosum.pdf
    • https://somoxikona393201633.files.wordpress.com/2020/06/furozepuwiredipemawaw.pdf
    • https://rinuvojoza.files.wordpress.com/2020/06/reviwakafatokojorodowuni.pdf
    • https://porugisi.files.wordpress.com/2020/06/sapiwanaxaromodekakejate.pdf
    • https://roropebuj.files.wordpress.com/2020/06/79811275021.pdf
    • https://tegafularak.files.wordpress.com/2020/06/40356761337.pdf
    • https://zunuxav.files.wordpress.com/2020/06/xateda.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_off0000a2e1.bin
cfbf31d366ffd901ce4f481fbe56f277ccae31b5dfb9ceb228ac7e0e1d6738d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E1 10808 bytes