Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27b59051aeae8e0…

MALICIOUS

PDF

66.0 KB Created: 2020-03-23 14:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f0206230bb657037c293c628bcc6024 SHA-1: 8c1708a82d7c0c591231a0ddb078969e78dac837 SHA-256: c27b59051aeae8e06f0a98aebb478531e7b5b3aa899648c068031285ae3e07be
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 External Remote Services T1204 User Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body is heavily obfuscated but contains references to URLs, suggesting a link farm or redirection scheme to distribute malicious content or manipulate search engine results. 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://gotrsummit.com/uploads/1/3/0/3/130379814/130379814.html#sanidad+e+higiene+alimentaria+pdf
    • http://www.aplacetocreatewashougal.com/uploads/1/3/0/9/130969061/54c1df9d1991a1.pdf
    • http://varandaderetalhos.com/uploads/1/3/0/4/130491418/4495968.pdf
    • http://humanitarianspirit.com/uploads/1/3/0/4/130493037/5b407ec62736982.pdf
    • http://obccbd.com/uploads/1/3/0/2/130289291/gekuluseveraf_kuworuze_limaselejup.pdf
    • http://sanvatquenha.com/uploads/1/3/0/4/130489650/6086704.pdf
    • http://apextechnologies.services/uploads/1/3/0/9/130969679/wawimoxutexufikob.pdf
    • http://www.estonesphotography.com/uploads/1/3/0/7/130740466/8ca5ec975f9f5.pdf
    • http://2021cruises.com/uploads/1/3/0/4/130476427/vagojejed-kemirexumobi-pumavana.pdf
    • http://holub.life/uploads/1/3/0/6/130605383/nezapur_xemerado.pdf
    • http://www.maelstrommaster.com/uploads/1/3/0/4/130483239/tisodusodupuw_gatefesiza_torizulanazo_kepas.pdf
    • http://johnjdobbs.net/uploads/1/3/0/7/130775758/ninesivumirotab.pdf
    • http://www.sandyburlesoneportfoliowfu.com/uploads/1/3/0/6/130639115/a47a6814107900.pdf
    • http://elginland.com/uploads/1/3/0/3/130380002/jebaza.pdf
    • http://74-123-75-130.mgwnet.com/uploads/1/3/1/0/131069886/5154512.pdf
    • http://mta32.somekindofsimple.com/uploads/1/3/0/7/130775047/eef254.pdf
    • http://laganbuildingsolutions.net/uploads/1/3/0/8/130813510/d5d7f06.pdf
    • http://eycongrats.com/uploads/1/3/0/4/130435553/4621236.pdf
    • http://cleaningservicesresidentialcommercial.com/uploads/1/3/0/6/130603803/nunolapidu.pdf
    • http://sophieleblancvisualmedia.com/uploads/1/3/0/5/130551299/9733391.pdf
    • http://mercigifts.ca/uploads/1/3/0/6/130639901/fujukuruzuxuzikoxa.pdf
    • http://www.mrjohnmiddleton.com/uploads/1/3/0/9/130968981/9190120.pdf
    • http://www.chabadstudentcenter.com/uploads/1/3/0/7/130740128/4294401.pdf
    • http://kindredphr.io/uploads/1/3/0/2/130274282/19585.pdf
    • http://hostmaster.virtuago.it/uploads/1/3/0/2/130289399/7c84e7.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_off0000d87a.bin
ab27b3a64e717332c9c9ab8ee2969ffaefe236bff98fe3cf0a72b391f916b7df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 9248 bytes

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