Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec2db723b1d31cd…

MALICIOUS

PDF

53.5 KB Created: 2020-06-06 12:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 1c71493639a4990a80261485414b67e6 SHA-1: a9a423600175f6dc73e5fb917c51fc672b654b4e SHA-256: cec2db723b1d31cdb0af7d09f28e2e30bb7d71ed4949517122eaef4ff081d5ef
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The document body mentions 'Avenger infinity war', likely a lure to encourage users to interact with the embedded links. The ML classifier strongly indicates maliciousness. No scripts were extracted from this sample.

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://medpulsenj.com/uploads/1/3/0/7/130740089/130740089.html#avenger+infinity+war PDF link annotation
    • http://mhtrwlibrary.com/uploads/1/3/0/5/130589244/wabinoni-vexap-vulozunolavon.pdfIn PDF document text
    • http://stricklandoutdoorsupply.com/uploads/1/3/0/5/130588633/refivalokidepot_nivux_lidogawin_pavufew.pdfIn PDF document text
    • http://re-memberthemovement.org/uploads/1/3/0/7/130775889/danebozosuxu.pdfIn PDF document text
    • http://autodiscover.westfieldvictory.com/uploads/1/3/1/4/131438419/rabezimexanaxivarig.pdfIn PDF document text
    • http://gamungkinlah.net/uploads/1/3/0/5/130589077/ruzavijaniz.pdfIn PDF document text
    • http://kidscookingclub.net/uploads/1/3/0/4/130489530/bajowetotumomu.pdfIn PDF document text
    • http://swisspropertymanagement.com/uploads/1/3/0/5/130551106/930fee9dcad4.pdfIn PDF document text
    • http://ejuicebunker.net/uploads/1/3/1/6/131637178/7995076.pdfIn PDF document text
    • http://pixandwix.com/uploads/1/3/0/2/130289222/temiw_gevezigomikerek_xitom.pdfIn PDF document text
    • http://medpulsenj.com/uploads/1/3/0/7/130740089/terms.htmlIn PDF document text
    • http://medpulsenj.com/uploads/1/3/0/7/130740089/dmca.htmlIn PDF document text
    • http://medpulsenj.com/uploads/1/3/0/7/130740089/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://genotome.files.wordpress.com/2020/06/pogeritiluf.pdfIn PDF document text
    • https://zixakexixo.files.wordpress.com/2020/06/dudopogiboxa.pdfIn PDF document text
    • https://kubuwenix.files.wordpress.com/2020/06/giwogoduwotazopelisekami.pdfIn PDF document text
    • https://bosebavu.files.wordpress.com/2020/06/42601650935.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3F 14468 bytes
SHA-256: c940a11378d0ebc60e21c3a3e32f791abfcfdc18d7fdd07867cfb538d765e834
font_01_sfnt_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 16416 bytes
SHA-256: af6545cc2318d27ecafec356b4bc3a1ae9bf93fb34fea327676f982b27d16dce

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