Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7135581a0f004a…

MALICIOUS

PDF

40.2 KB Created: 2020-03-12 02:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e99cfbb05c5d201d24d82b45210d0cdf SHA-1: c816856ea25928cdcf9ca86ccf5a8517e503d743 SHA-256: df7135581a0f004a190327f1b7a4f333fe0a1ddb2af0061f29dfc7782b197f12
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to external content, potentially malicious, rather than containing a direct exploit within the PDF itself.

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://www.rebeccachin.com/uploads/1/3/1/1/131164174/131164174.html#filezilla+ftp+server+root+folder
    • http://new.gruupmeet.com/uploads/1/3/0/4/130488401/3167f3bc951.pdf
    • http://mikhaelbassilli.com/uploads/1/3/0/2/130287536/84b6a6c39.pdf
    • http://simplicityaccountingllc.com/uploads/1/3/0/5/130550714/211864.pdf
    • http://agapekennelswhitewater.com/uploads/1/3/0/5/130540472/kenanabemorusu-pevalubafoduxer-pifed-ninanumuvekerot.pdf
    • http://server.morantis.com/uploads/1/3/0/6/130604088/xerovozatafezuw.pdf
    • http://nysympathyfloral.com/uploads/1/3/0/7/130776374/xidopaji_futulalemigof_gitisixixaxi.pdf
    • http://nimu-mm.org/uploads/1/3/0/5/130543945/besixi_wasibipodumixef.pdf
    • http://www.pandiontactical.com/uploads/1/3/0/6/130604397/nazodawagipe_bajunate_wanakinasu.pdf
    • http://merakihealing.org/uploads/1/3/0/5/130588499/netuwewos_kutenol.pdf
    • http://neverweatherband.com/uploads/1/3/0/8/130813136/kawamavaf.pdf
    • http://terlouwcounseling.com/uploads/1/3/0/6/130605204/vapoxujisu_wojeviwatinaf_wulubilelunibox.pdf
    • http://paintgator.com/uploads/1/3/0/2/130287284/1584548.pdf
    • http://alexeybarilo.com/uploads/1/3/0/2/130272493/8630122.pdf
    • http://mamajamas.com/uploads/1/3/0/6/130639222/zixufolawupunitutej.pdf
    • http://seniors-who-care.com/uploads/1/3/0/8/130874283/vogoxigesawepopijox.pdf
    • http://webdisk.shoreliteracy.org/uploads/1/3/0/9/130969472/fb434a112.pdf
    • http://cheeriotheshibainu.com/uploads/1/3/0/3/130323659/vijojereteparalatod.pdf
    • http://rogueshoeco.com/uploads/1/3/0/7/130775560/2711577.pdf
    • http://www.daretodreamteam.org/uploads/1/3/0/7/130775361/6411422.pdf
    • http://thekaizenexports.com/uploads/1/3/0/2/130272281/siwuwoduwikafodi.pdf
    • http://westmatforklifts.com/uploads/1/3/0/4/130483343/682df857fd74cd4.pdf
    • http://stevejager.com/uploads/1/3/0/6/130604336/0945e22dc0.pdf
    • http://www.oakhurstconsulting.co.uk/uploads/1/3/0/3/130313102/jejasatinubora.pdf
    • http://mx.stocktonbowlinglanes.com/uploads/1/3/0/8/130874180/bupeganebu.pdf
    • http://meridianworldschoollibrary.com/uploads/1/3/0/4/130476340/415d58401.pdf
    • http://www.oakhurstconsulting.co.uk/uploa
    • 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_off000075c8.bin
a56789fb36283030449ca73cc0a0c648028d1dbf1508fc365677aca1d0d5a0f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C8 7464 bytes

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