Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f99e2b14cb28ef…

MALICIOUS

PDF

48.3 KB Created: 2020-03-30 06:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6658f027c5c135f3e6e5937e9ded20d9 SHA-1: f4686faa8fdd11fe8d59e5769cacb77a1fa66d51 SHA-256: 86f99e2b14cb28efce1f3244414864507300b69ab816761843879165f5b43dfa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded 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, though partially corrupted, contains text related to 'Talleres de autoestima para niños y adolescentes' and includes the wkhtmltopdf generator, suggesting a potential lure to SEO-optimized content or a phishing attempt disguised as educational material. 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://amazingjourneytravel.voyagerwebsites.com/uploads/1/3/0/7/130739897/130739897.html#talleres+de+autoestima+para+ni%C3%B1os+y+adolescentes
    • http://thehouseofbooks.co.uk/uploads/1/3/0/2/130270979/sikejesebupu.pdf
    • http://mta-sts.coopergearmfg.com/uploads/1/3/0/8/130814644/riwikasatiluzej.pdf
    • http://pineapplehomestudios.com/uploads/1/3/0/5/130551794/c9daa702d5.pdf
    • http://mysonnyrae.com/uploads/1/3/0/7/130775563/bixunuwasuz.pdf
    • http://maipreferredproperties.com/uploads/1/3/0/9/130969515/nokav.pdf
    • http://petdiner.com/uploads/1/3/0/6/130639241/veridomasupoxot-luzuwolefopuni.pdf
    • http://stevierice.com/uploads/1/3/0/8/130873779/1965339.pdf
    • http://1133northwestlstreet.com/uploads/1/3/0/5/130588162/dilodijetutepe-gojoninuwe-marusadegigufo.pdf
    • http://ttsswflsalonspa.com/uploads/1/3/0/7/130775610/lupovogot-reduju.pdf
    • http://loveisthecolourred.com/uploads/1/3/1/3/131379179/8878867.pdf
    • http://treasuresoncanterbury.com/uploads/1/3/0/5/130588277/74733747ff2.pdf
    • http://poorboyspaper.com/uploads/1/3/0/4/130476921/1831366.pdf
    • http://theathleticallyspeaking.org/uploads/1/3/0/6/130604394/gisakuxufonix.pdf
    • http://dmscodes.com/uploads/1/3/1/1/131164156/risogexas.pdf
    • http://myvisl.com/uploads/1/3/0/5/130589285/b5c3c64de7a14b8.pdf
    • http://muellersmartialarts.com/uploads/1/3/0/6/130621110/tolosulebiti_ruruwebove.pdf
    • http://picocita.com/uploads/1/3/0/7/130775813/wizefonirefiwog_womep_pudobovafa.pdf
    • http://ryankatiraeiwrites.com/uploads/1/3/0/6/130604543/repapiroremufo_fezeminavorugij.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_off0000914c.bin
bb4fc9c593db387e666c8c63327bc8e36c2d8d08d48a041721ce0217e9e0712b
pdf-font-stream PDF embedded font (sfnt) at offset 0x914C 8828 bytes