Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efc2bb3e3b9c021…

MALICIOUS

PDF

39.9 KB Created: 2020-03-26 15:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 004acd7ed74074d6d036b063a6428e09 SHA-1: 92f9ea42493ab0e5031a440880fbfd78954a861a SHA-256: 0efc2bb3e3b9c0216d27f7f75356ad212ba785564bee5cc322e181b66ba53bad
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, disguised as a guide for creating a personalized calendar. The ML classifier strongly indicates maliciousness, and the presence of numerous PDF links suggests a link farm or a mechanism to distribute further malicious content. The document's primary function appears to be directing users to these external resources, likely for exploitation or further malware delivery.

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://grheatingandcooling.net/uploads/1/3/0/8/130813373/130813373.html#como+hacer+un+calendario+personalizado+en+casa
    • http://lincolnbailbonds.net/uploads/1/3/0/5/130547450/a9c03.pdf
    • http://strategizeme.com/uploads/1/3/0/9/130969389/kizoxe.pdf
    • http://shop.tasktosuccess.com/uploads/1/3/1/1/131164496/xexemotaguridam-fatodelane-tarufadij.pdf
    • http://sekolahkreatifindonesia.com/uploads/1/3/0/6/130604604/tosoletotove.pdf
    • http://cameronattee.com/uploads/1/3/0/6/130604548/vulazu-jikap-xoxuladovuvo.pdf
    • http://www.gdohowell.com/uploads/1/3/0/6/130639407/4771d8996.pdf
    • http://trfmontpelier.com/uploads/1/3/0/6/130621164/5693418.pdf
    • http://burwelltechnologies.com/uploads/1/3/0/3/130323461/95b2e3c3ae05b3e.pdf
    • http://mysprout.shop/uploads/1/3/0/2/130270777/polofuj_xomofegudubika_kezibekurob.pdf
    • http://adfpainting.boston/uploads/1/3/0/7/130776336/bojeguxifimomax.pdf
    • http://ancestreemusic.com/uploads/1/3/0/6/130605176/ab17c7d469.pdf
    • http://relaykids.com/uploads/1/3/0/6/130620282/jobatowa.pdf
    • http://crystaltubbscleaning.com/uploads/1/3/0/6/130621223/5017d57570fd645.pdf
    • http://optimumfamilyservicesllc.net/uploads/1/3/0/5/130589229/xizuza.pdf
    • http://artbytravis.com/uploads/1/3/0/7/130739852/6534491.pdf
    • http://abrolhoslandscaping.com.au/uploads/1/3/0/5/130590180/1f5aa562005b7.pdf
    • http://meowsitting.co.uk/uploads/1/3/0/5/130550824/5aa011e22114.pdf
    • http://soulcoachlisa.com/uploads/1/3/0/5/130550817/80083ad95a.pdf
    • http://captivated.blog/uploads/1/3/0/2/130288673/ratofa_wexevo.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_off0000712c.bin
c1b8383a801a0c29a2c816755469eeecfca7bed87df1d95f2ee52735989e85b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712C 8440 bytes

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