Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6bf34878179189…

MALICIOUS

PDF

38.3 KB Created: 2020-05-24 19:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0865c3ba0e95eeb5f366d679e2199652 SHA-1: e4565ccbac99d41355d632705c7b3e9dce67c52f SHA-256: eb6bf34878179189dff48ab804779e36148a55c3fd7301bbe74545ca31cf7301
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially garbled, contains URLs that are part of this link farm. The primary attack pattern appears to be SEO spam or a link distribution scheme, potentially leading to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://brahmaathletics.com/uploads/1/3/0/7/130738917/130738917.html#huzursuzlu%25C4%259Fun+kitab%25C4%25B1+pessoa
    • http://harvestclevelandne.org/uploads/1/3/1/3/131384679/5525335.pdf
    • http://moiraelliottartist.com/uploads/1/3/0/7/130738554/vunimogasiwen.pdf
    • http://teukolskylaw.com/uploads/1/3/1/4/131437784/9fe39f8d3.pdf
    • http://empowerhomeautomation.com.au/uploads/1/3/0/9/130969674/zavirilozomerixajepu.pdf
    • http://clayforacure.com/uploads/1/3/0/7/130775049/karenoxukivo.pdf
    • http://quintaldobolo.com/uploads/1/3/0/2/130272516/peniletagan_lifugabiweriji_bokofagasot_gosigomafup.pdf
    • http://theintuitivemethod.com/uploads/1/3/0/4/130436315/8240911.pdf
    • http://cobramachine.com/uploads/1/3/1/8/131872107/2331092.pdf
    • http://urbanizacion.info/uploads/1/3/0/9/130969130/melurop.pdf
    • http://medicon-personal.team/uploads/1/3/1/6/131637303/4951651.pdf
    • http://youniquebysherrygibson.com/uploads/1/3/0/6/130605430/1133466.pdf
    • http://stauntonpersonalstyling.com/uploads/1/3/0/2/130272328/gadatelegosamoguviru.pdf
    • http://mattscarpino.com/uploads/1/3/1/1/131164499/fonivaketilopax_sofoper_befimi_watazasenugi.pdf
    • http://sallyanneleigh.org/uploads/1/3/0/6/130605442/9022061.pdf
    • http://iriderentals.com/uploads/1/3/0/3/130323527/3175632.pdf
    • http://sprinklersystemspecialists.net/uploads/1/3/0/6/130621798/zumunijexob_rolobapavonuwex_fajanaduto_lerajesaki.pdf
    • http://askwilliam.org/uploads/1/3/0/7/130776573/5d84cbfc708d6.pdf
    • http://wholisticzine.com/uploads/1/3/0/6/130603682/5b055b8a3ca48c1.pdf
    • http://cavendishschoolseries.com/uploads/1/3/0/5/130544132/bajafiku-jipulad-kegamununemujug-situtowuganat.pdf
    • http://rolloneyoubears.com/uploads/1/3/1/3/131381497/538056.pdf
    • http://chicagokilnrepair.com/uploads/1/3/0/6/130639263/komogirezop.pdf
    • http://vitalrecovery.ca/uploads/1/3/1/4/131453682/b95bf.pdf
    • http://pedalling-backwards.com/uploads/1/3/1/0/131070754/2742999.pdf
    • http://amsdiscounts.com/uploads/1/3/0/7/130775271/aac27792ed89.pdf
    • http://piso-venta-chamartin-madrid-norte-castilla-agustin-foxa.info/uploads/1/3/1/0/131070723/musanenoliba.pdf
    • http://amsdiscounts.com/uploads/1/3/0/7/130775271/aac2
    • 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_off000065b5.bin
a77ba84f5a61e0204611aff316edd9abc67c95d8e1da8b583b5d9b363bd35dac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B5 12112 bytes

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