Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62175cc9ba1f5a5…

MALICIOUS

PDF

40.1 KB Created: 2020-03-21 16:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: a4396198ce6ee8f6b063f3c76dd60e50 SHA-1: c2187c795c389761d845af3a7841889f2d19de55 SHA-256: b62175cc9ba1f5a57091fb61c9bf7c4bb201df55d7d57325da06ca40d0d377e6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO spam or a link farm used to distribute malicious content or drive traffic. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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://wdfilms.org/uploads/1/3/0/7/130739053/130739053.html#clasificacion+de+heridas+segun+el+agente+causal PDF link annotation
    • http://oceanpsalms.com/uploads/1/3/0/8/130814843/xogomen.pdfIn PDF document text
    • http://www.gssalon-jp.com/uploads/1/3/0/8/130813317/d2c2f14e127.pdfIn PDF document text
    • http://split-quick.com/uploads/1/3/0/4/130488539/9d668f2789.pdfIn PDF document text
    • http://autodiscover.data-in-harmony.com/uploads/1/3/0/8/130814172/rufuvukamigakujisag.pdfIn PDF document text
    • http://nicoleolsthoorn.com/uploads/1/3/0/2/130272295/nilunugerenemof.pdfIn PDF document text
    • http://hostmaster.jbhealth.co.uk/uploads/1/3/0/8/130874470/nedet-zejozuvaxijopik-tozevozil.pdfIn PDF document text
    • http://hostmaster.newyorker.beer/uploads/1/3/0/6/130604769/kivasutexot.pdfIn PDF document text
    • http://pholmes-iplaw.com/uploads/1/3/0/4/130483900/tomowupufaxan_ronagos_gavojirivonofi.pdfIn PDF document text
    • http://campuscircle.org/uploads/1/3/0/3/130379391/20b5d.pdfIn PDF document text
    • http://www.gebainflow.com/uploads/1/3/0/2/130270745/458766b50be6.pdfIn PDF document text
    • http://davidmichaeldesigns.com/uploads/1/3/0/6/130603903/donobepunefizoveseki.pdfIn PDF document text
    • http://neulip.net/uploads/1/3/0/5/130542734/177013.pdfIn PDF document text
    • http://www.preparetobvowed.com/uploads/1/3/0/5/130551013/bivadu.pdfIn PDF document text
    • http://juggernautpublications.com/uploads/1/3/0/6/130621312/1dcaa850d.pdfIn PDF document text
    • http://madwellkale.com/uploads/1/3/0/4/130488399/musoluwujotow_solotu_jirajas.pdfIn PDF document text
    • http://jillmansfieldinteriors.com/uploads/1/3/0/5/130588419/gotaro_kaxalid_pofukeladepukam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 8936 bytes
SHA-256: 6a814aa46a1b2fcba52a6007ebf0809776922283918a7d44d33e4252ce37b730