Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b59f7e4e4da5e1…

MALICIOUS

PDF

31.7 KB Created: 2020-06-06 08:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 618548f2c64ac7abe08fc0cccf2de8ec SHA-1: 1c150c7b45980081efea7d1c1328523245eb6126 SHA-256: 60b59f7e4e4da5e17a08d719b2d2ea836f9f73cbb495a8906dbdd9b0d747197b
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 by heuristics. The embedded URLs point to various PDF files hosted on numerous subdomains, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. While no scripts were directly extracted, the nature of the link farm and the ML classifier's high confidence indicate malicious intent, likely related to distributing malware or phishing 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://vintage-pop.store/uploads/1/3/1/3/131398544/131398544.html#modern+physics+book+by+r+murugeshan
    • http://hostmaster.painswicknaturallivery.com/uploads/1/3/0/7/130775982/sowiwebiwesutad-jonapax-bizon-pudazevuw.pdf
    • http://hostmaster.wiganhandyman.co.uk/uploads/1/3/1/8/131858791/655235b.pdf
    • http://asanaforone.com/uploads/1/3/1/3/131383493/doxozibe.pdf
    • http://ghostadsofbirmingham.com/uploads/1/3/1/4/131407047/zodix.pdf
    • http://flicsparks.com/uploads/1/3/1/8/131872144/3076062.pdf
    • http://hongliguojixianjinbaijiale.br3h.com/uploads/1/3/0/4/130476844/kitokupob_kagof_famivuguz.pdf
    • http://lindathelifecoach.com/uploads/1/3/0/5/130551534/zepujega_fowavixumojezi_lomojes.pdf
    • http://u0a6a.bpmtc.com/uploads/1/3/0/7/130775092/bepebikabexu-nirubusaxuwogo-volesupoten-tadojatoj.pdf
    • http://heartbeatofboston.com/uploads/1/3/0/6/130604703/xuvapinadawa.pdf
    • http://canismajormudi.com/uploads/1/3/0/6/130639936/ca921.pdf
    • http://prioritywellnessdesign.com/uploads/1/3/1/3/131382808/dowax.pdf
    • http://mta-sts.zlotaelita.com.pl/uploads/1/3/0/7/130738534/fekagebavosom_saxar_kugul.pdf
    • http://mail.simplysaidtheweddingstore.com/uploads/1/3/0/8/130814469/dadolet.pdf
    • http://vintage-pop.store/uploads/1/3/1/3/131398544/terms.html
    • http://vintage-pop.store/uploads/1/3/1/3/131398544/dmca.html
    • http://vintage-pop.store/uploads/1/3/1/3/131398544/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://numafudip544870020.files.wordpress.com/2020/06/napekozetunazowebafo.pdf
    • https://nadolafulon.files.wordpress.com/2020/06/3068967162.pdf
    • https://kijerap.files.wordpress.com/2020/06/6759666700.pdf
    • https://dowenegiluz.files.wordpress.com/2020/06/2288110149.pdf
    • https://fewipix.files.wordpress.com/2020/06/43854187731.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_off00005228.bin
afe635ed9388552f794bef625c4539613720c55f2559470177f702dfc8fef991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5228 9620 bytes

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